View allAll Photos Tagged persistent
Life’s most persistent and urgent question is,
‘What are you doing for others?’
{ Martin Luther King, Jr. }
- - - - -
Will catch up on your streams today. Been quite busy playing host to my family.
Thank you for coming here still, and leaving comments. =)
Persistent URL: floridamemory.com/items/show/256548
Local call number: KOR0860
Title: Annie Ray Andrews at Washington Park in Albany, New York
Date: June 1, 1910
Physical descrip: 1 photoprint - b&w - 2 x 3 in.
Series Title: Koreshan Unity Collection
Repository: State Library and Archives of Florida
500 S. Bronough St., Tallahassee, FL, 32399-0250 USA, Contact: 850.245.6700, Archives@dos.myflorida.com
Persistent URL: digital.lib.muohio.edu/u?/tradecards,3746
Subject (TGM): Coffee industry; Humorous pictures; Animals in human situations; Crows; Ravens; Owls; Flowers;
Persistent URL: digital.lib.muohio.edu/u?/tradecards,4010
Subject (TGM): Coffee industry; Animals in human situations; Cats; Musical instruments; Marching bands;
Persistent URL: www.floridamemory.com/items/show/322854
Title: Learned it in Back Days and Kept It: A portrait of Lucreaty Clark
Date of film: 1981
Physical descrip: color; sound; original length: 28:40
General note: In this documentary produced by the Florida Folklife Program, Folk heritage award recipient and white oak basket maker Lucreaty Clark discusses the long tradition of basket making in her Jefferson county family.
To see full-length versions of this and other videos from the State Archives of Florida, visit www.floridamemory.com/video/.
Repository: State Library and Archives of Florida, 500 S. Bronough St., Tallahassee, FL 32399-0250 USA. Contact: 850.245.6700. Archives@dos.myflorida.com
Persistent URL: www.floridamemory.com/items/show/36872
Local call number: RC15258
Title: Passengers on a Pan Am Boeing 307
Date: ca. 1946
Physical descrip: 1 photoprint - b&w - 8 x 10 in.
Series Title: Reference Collection
Repository: State Library and Archives of Florida, 500 S. Bronough St., Tallahassee, FL 32399-0250 USA. Contact: 850.245.6700. Archives@dos.myflorida.com
Hood, S. J.
Part of the collection: J.C. Williamson collection of photographs.; Also available in an electronic version via the Internet at: nla.gov.au/nla.pic-vn3509141; Seasons in Australasia recorded in programs and ephemera held in J.C. Williamson collection, PROMPT Collection : 1928 commencing 28 April. Theatre Royal, Melbourne ; 1928 commencing 6 October. His Majesty's Theatre, Brisbane ; 1942 commencing 4 July. Theatre Royal, Sydney ; 1943 commencing 21 August. His Majesty's Theatre, Melbourne ; 1947 commencing 9 August. Theatre Royal.
Persistent URL
Persistent URL: floridamemory.com/items/show/58228
Local call number: c620928
Title: Atkins Technical, Inc. employee posing with equipment - Gainesville, Florida
Date: March 1963
Physical descrip: 1 photoprint - b&w - 5 x 4 in.
Series Title: Department of Commerce Collection
Repository: State Library and Archives of Florida
500 S. Bronough St., Tallahassee, FL, 32399-0250 USA, Contact: 850.245.6700, Archives@dos.myflorida.com
Persistent URL: www.floridamemory.com/items/show/30684
Local call number: RC07599
Title: Sikorsky S-42 plane over Miami
Date: ca. 1939
Physical descrip: photoprint - b&w - 8 x 10 in.
Series Title: Reference Collection
Repository: State Library and Archives of Florida, 500 S. Bronough St., Tallahassee, FL 32399-0250 USA. Contact: 850.245.6700. Archives@dos.myflorida.com
Margolies, John,, photographer.
Zig zag hole, Atkinson mini golf, Aberdeen, South Dakota
1987.
1 photograph : color transparency ; 35 mm (slide format).
Notes:
Title, date and keywords based on information provided by the photographer.
Purchase; John Margolies 2010 (DLC/PP-2010:191).
Credit line: John Margolies Roadside America photograph archive (1972-2008), Library of Congress, Prints and Photographs Division.
Please use digital image: original slide is kept in cold storage for preservation.
Forms part of: John Margolies Roadside America photograph archive (1972-2008).
Subjects:
Miniature golf--1980-1990.
United States--South Dakota--Aberdeen.
Format: Slides--1980-1990.--Color
Rights Info: No known restrictions on publication. For more information, see "John Margolies Roadside America Photograph Archive - Rights and Restrictions Information" www.loc.gov/rr/print/res/723_marg.html
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
Part Of: Margolies, John John Margolies Roadside America photograph archive (DLC) 2010650110
General information about the John Margolies Roadside America photograph archive is available at hdl.loc.gov/loc.pnp/pp.mrg
Higher resolution image is available (Persistent URL): hdl.loc.gov/loc.pnp/mrg.02828
Call Number: LC-MA05- 2828
It took a few visits at this spot along the rugged west coast of Vancouver Island to get a nice sunset, but persistence finally paid off.
If you're interested in being guided to some cool places on Vancouver Island like the one you see in this photo or if you're interested in landscape photography instructions - lessons while out in the field please click on the link below to see my rates:
Persistent URL: digital.lib.muohio.edu/u?/snyder,2109
Subject (TGM): Student organizations; Literature; Group portraits;
Martin, W. H., 1865-1940,, photographer.
"Bringing in the sheaves"
[Ottawa, Kansas] : [W.H. Martin], [1908]
1 photograph : gelatin silver print ; sheet 9 x 14 cm (postcard format)
Notes:
Photomontage on exaggeration postcard shows three women and one man in front of barn with horse and wagon and larger-than-life pumpkins, corn on the cob, and cabbages.
Title from item.
Forms part of: Karen A. Stuart collection of postcards (Library of Congress).
Addressed to G.J. Dressler, Buchanan, Mich. Postmarked Hastings, Nebraska, April 5, 1908. DLC
Stamped on recto: "Nebraska products." DLC
On recto: "Copyrighted photograph 1908. W.H. Martin, Ottawa, Kans."
Served by appointment only (Unprocessed). To make a request, see "Access to Unprocessed Materials," www.loc.gov/rr/print/info/022_unpr.html
Gift; Laura Kells ; 2019; (DLC/PP-2019:085).
Subjects:
Farming--1900-1910.
Corn--1900-1910.
Cabbage--1900-1910.
Pumpkins--1900-1910.
Format: Humorous pictures--1900-1910.
Montages--1900-1910.
Photographic postcards--1900-1910.
Photographic prints--1900-1910.
Rights Info: No known restrictions on publication.
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
Higher resolution image is available (Persistent URL): hdl.loc.gov/loc.pnp/ppmsca.67977
Call Number: Unprocessed in PR 13 CN 2019:085 [item]
Persistent pain experienced when we are young and active is unlikely to be accepted as something which is ‘normal’. Indeed, we are likely to do everything we can to ensure we obtain the best available help and find the treatment most effective to manage the pain.
Such attitudes and beliefs should not change with older age. Yet, pain in older people is highly prevalent and widely accepted as something to be expected and regarded as ‘normal’ in later life. Hence, suffering associated with persistent pain in older people often occurs without the appropriate assessment and treatment.
Coronavirus disease 2019 (COVID-19) is an infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).[8] The disease was first identified in December 2019 in Wuhan, the capital of China's Hubei province, and has since spread globally, resulting in the ongoing 2019–20 coronavirus pandemic.[9][10] As of 26 April 2020, more than 2.89 million cases have been reported across 185 countries and territories, resulting in more than 203,000 deaths. More than 822,000 people have recovered.[7]
Common symptoms include fever, cough, fatigue, shortness of breath and loss of smell.[5][11][12] While the majority of cases result in mild symptoms, some progress to viral pneumonia, multi-organ failure, or cytokine storm.[13][9][14] More concerning symptoms include difficulty breathing, persistent chest pain, confusion, difficulty waking, and bluish skin.[5] The time from exposure to onset of symptoms is typically around five days but may range from two to fourteen days.[5][15]
The virus is primarily spread between people during close contact,[a] often via small droplets produced by coughing,[b] sneezing, or talking.[6][16][18] The droplets usually fall to the ground or onto surfaces rather than remaining in the air over long distances.[6][19][20] People may also become infected by touching a contaminated surface and then touching their face.[6][16] In experimental settings, the virus may survive on surfaces for up to 72 hours.[21][22][23] It is most contagious during the first three days after the onset of symptoms, although spread may be possible before symptoms appear and in later stages of the disease.[24] The standard method of diagnosis is by real-time reverse transcription polymerase chain reaction (rRT-PCR) from a nasopharyngeal swab.[25] Chest CT imaging may also be helpful for diagnosis in individuals where there is a high suspicion of infection based on symptoms and risk factors; however, guidelines do not recommend using it for routine screening.[26][27]
Recommended measures to prevent infection include frequent hand washing, maintaining physical distance from others (especially from those with symptoms), covering coughs, and keeping unwashed hands away from the face.[28][29] In addition, the use of a face covering is recommended for those who suspect they have the virus and their caregivers.[30][31] Recommendations for face covering use by the general public vary, with some authorities recommending against their use, some recommending their use, and others requiring their use.[32][31][33] Currently, there is not enough evidence for or against the use of masks (medical or other) in healthy individuals in the wider community.[6] Also masks purchased by the public may impact availability for health care providers.
Currently, there is no vaccine or specific antiviral treatment for COVID-19.[6] Management involves the treatment of symptoms, supportive care, isolation, and experimental measures.[34] The World Health Organization (WHO) declared the 2019–20 coronavirus outbreak a Public Health Emergency of International Concern (PHEIC)[35][36] on 30 January 2020 and a pandemic on 11 March 2020.[10] Local transmission of the disease has occurred in most countries across all six WHO regions.[37]
File:En.Wikipedia-VideoWiki-Coronavirus disease 2019.webm
Video summary (script)
Contents
1Signs and symptoms
2Cause
2.1Transmission
2.2Virology
3Pathophysiology
3.1Immunopathology
4Diagnosis
4.1Pathology
5Prevention
6Management
6.1Medications
6.2Protective equipment
6.3Mechanical ventilation
6.4Acute respiratory distress syndrome
6.5Experimental treatment
6.6Information technology
6.7Psychological support
7Prognosis
7.1Reinfection
8History
9Epidemiology
9.1Infection fatality rate
9.2Sex differences
10Society and culture
10.1Name
10.2Misinformation
10.3Protests
11Other animals
12Research
12.1Vaccine
12.2Medications
12.3Anti-cytokine storm
12.4Passive antibodies
13See also
14Notes
15References
16External links
16.1Health agencies
16.2Directories
16.3Medical journals
Signs and symptoms
Symptom[4]Range
Fever83–99%
Cough59–82%
Loss of Appetite40–84%
Fatigue44–70%
Shortness of breath31–40%
Coughing up sputum28–33%
Loss of smell15[38] to 30%[12][39]
Muscle aches and pains11–35%
Fever is the most common symptom, although some older people and those with other health problems experience fever later in the disease.[4][40] In one study, 44% of people had fever when they presented to the hospital, while 89% went on to develop fever at some point during their hospitalization.[4][41]
Other common symptoms include cough, loss of appetite, fatigue, shortness of breath, sputum production, and muscle and joint pains.[4][5][42][43] Symptoms such as nausea, vomiting and diarrhoea have been observed in varying percentages.[44][45][46] Less common symptoms include sneezing, runny nose, or sore throat.[47]
More serious symptoms include difficulty breathing, persistent chest pain or pressure, confusion, difficulty waking, and bluish face or lips. Immediate medical attention is advised if these symptoms are present.[5][48]
In some, the disease may progress to pneumonia, multi-organ failure, and death.[9][14] In those who develop severe symptoms, time from symptom onset to needing mechanical ventilation is typically eight days.[4] Some cases in China initially presented with only chest tightness and palpitations.[49]
Loss of smell was identified as a common symptom of COVID‑19 in March 2020,[12][39] although perhaps not as common as initially reported.[38] A decreased sense of smell and/or disturbances in taste have also been reported.[50] Estimates for loss of smell range from 15%[38] to 30%.[12][39]
As is common with infections, there is a delay between the moment a person is first infected and the time he or she develops symptoms. This is called the incubation period. The incubation period for COVID‑19 is typically five to six days but may range from two to 14 days,[51][52] although 97.5% of people who develop symptoms will do so within 11.5 days of infection.[53]
A minority of cases do not develop noticeable symptoms at any point in time.[54][55] These asymptomatic carriers tend not to get tested, and their role in transmission is not yet fully known.[56][57] However, preliminary evidence suggests they may contribute to the spread of the disease.[58][59] In March 2020, the Korea Centers for Disease Control and Prevention (KCDC) reported that 20% of confirmed cases remained asymptomatic during their hospital stay.[59][60]
A number of neurological symptoms has been reported including seizures, stroke, encephalitis and Guillain-Barre syndrome.[61] Cardiovascular related complications may include heart failure, irregular electrical activity, blood clots, and heart inflammation.[62]
Cause
See also: Severe acute respiratory syndrome coronavirus 2
Transmission
Cough/sneeze droplets visualised in dark background using Tyndall scattering
Respiratory droplets produced when a man is sneezing visualised using Tyndall scattering
File:COVID19 in numbers- R0, the case fatality rate and why we need to flatten the curve.webm
A video discussing the basic reproduction number and case fatality rate in the context of the pandemic
Some details about how the disease is spread are still being determined.[16][18] The WHO and the U.S. Centers for Disease Control and Prevention (CDC) say it is primarily spread during close contact and by small droplets produced when people cough, sneeze or talk;[6][16] with close contact being within approximately 1–2 m (3–7 ft).[6][63] Both sputum and saliva can carry large viral loads.[64] Loud talking releases more droplets than normal talking.[65] A study in Singapore found that an uncovered cough can lead to droplets travelling up to 4.5 metres (15 feet).[66] An article published in March 2020 argued that advice on droplet distance might be based on 1930s research which ignored the effects of warm moist exhaled air surrounding the droplets and that an uncovered cough or sneeze can travel up to 8.2 metres (27 feet).[17]
Respiratory droplets may also be produced while breathing out, including when talking. Though the virus is not generally airborne,[6][67] the National Academy of Sciences has suggested that bioaerosol transmission may be possible.[68] In one study cited, air collectors positioned in the hallway outside of people's rooms yielded samples positive for viral RNA but finding infectious virus has proven elusive.[68] The droplets can land in the mouths or noses of people who are nearby or possibly be inhaled into the lungs.[16] Some medical procedures such as intubation and cardiopulmonary resuscitation (CPR) may cause respiratory secretions to be aerosolised and thus result in an airborne spread.[67] Initial studies suggested a doubling time of the number of infected persons of 6–7 days and a basic reproduction number (R0 ) of 2.2–2.7, but a study published on April 7, 2020, calculated a much higher median R0 value of 5.7 in Wuhan.[69]
It may also spread when one touches a contaminated surface, known as fomite transmission, and then touches one's eyes, nose or mouth.[6] While there are concerns it may spread via faeces, this risk is believed to be low.[6][16]
The virus is most contagious when people are symptomatic; though spread is may be possible before symptoms emerge and from those who never develop symptoms.[6][70] A portion of individuals with coronavirus lack symptoms.[71] The European Centre for Disease Prevention and Control (ECDC) says while it is not entirely clear how easily the disease spreads, one person generally infects two or three others.[18]
The virus survives for hours to days on surfaces.[6][18] Specifically, the virus was found to be detectable for one day on cardboard, for up to three days on plastic (polypropylene) and stainless steel (AISI 304), and for up to four hours on 99% copper.[21][23] This, however, varies depending on the humidity and temperature.[72][73] Surfaces may be decontaminated with many solutions (with one minute of exposure to the product achieving a 4 or more log reduction (99.99% reduction)), including 78–95% ethanol (alcohol used in spirits), 70–100% 2-propanol (isopropyl alcohol), the combination of 45% 2-propanol with 30% 1-propanol, 0.21% sodium hypochlorite (bleach), 0.5% hydrogen peroxide, or 0.23–7.5% povidone-iodine. Soap and detergent are also effective if correctly used; soap products degrade the virus' fatty protective layer, deactivating it, as well as freeing them from the skin and other surfaces.[74] Other solutions, such as benzalkonium chloride and chlorhexidine gluconate (a surgical disinfectant), are less effective.[75]
In a Hong Kong study, saliva samples were taken a median of two days after the start of hospitalization. In five of six patients, the first sample showed the highest viral load, and the sixth patient showed the highest viral load on the second day tested.[64]
Virology
Main article: Severe acute respiratory syndrome coronavirus 2
Illustration of SARSr-CoV virion
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a novel severe acute respiratory syndrome coronavirus, first isolated from three people with pneumonia connected to the cluster of acute respiratory illness cases in Wuhan.[76] All features of the novel SARS-CoV-2 virus occur in related coronaviruses in nature.[77] Outside the human body, the virus is killed by household soap, which bursts its protective bubble.[26]
SARS-CoV-2 is closely related to the original SARS-CoV.[78] It is thought to have a zoonotic origin. Genetic analysis has revealed that the coronavirus genetically clusters with the genus Betacoronavirus, in subgenus Sarbecovirus (lineage B) together with two bat-derived strains. It is 96% identical at the whole genome level to other bat coronavirus samples (BatCov RaTG13).[47] In February 2020, Chinese researchers found that there is only one amino acid difference in the binding domain of the S protein between the coronaviruses from pangolins and those from humans; however, whole-genome comparison to date found that at most 92% of genetic material was shared between pangolin coronavirus and SARS-CoV-2, which is insufficient to prove pangolins to be the intermediate host.[79]
Pathophysiology
The lungs are the organs most affected by COVID‑19 because the virus accesses host cells via the enzyme angiotensin-converting enzyme 2 (ACE2), which is most abundant in type II alveolar cells of the lungs. The virus uses a special surface glycoprotein called a "spike" (peplomer) to connect to ACE2 and enter the host cell.[80] The density of ACE2 in each tissue correlates with the severity of the disease in that tissue and some have suggested that decreasing ACE2 activity might be protective,[81][82] though another view is that increasing ACE2 using angiotensin II receptor blocker medications could be protective and these hypotheses need to be tested.[83] As the alveolar disease progresses, respiratory failure might develop and death may follow.[82]
The virus also affects gastrointestinal organs as ACE2 is abundantly expressed in the glandular cells of gastric, duodenal and rectal epithelium[84] as well as endothelial cells and enterocytes of the small intestine.[85]
ACE2 is present in the brain, and there is growing evidence of neurological manifestations in people with COVID‑19. It is not certain if the virus can directly infect the brain by crossing the barriers that separate the circulation of the brain and the general circulation. Other coronaviruses are able to infect the brain via a synaptic route to the respiratory centre in the medulla, through mechanoreceptors like pulmonary stretch receptors and chemoreceptors (primarily central chemoreceptors) within the lungs.[medical citation needed] It is possible that dysfunction within the respiratory centre further worsens the ARDS seen in COVID‑19 patients. Common neurological presentations include a loss of smell, headaches, nausea, and vomiting. Encephalopathy has been noted to occur in some patients (and confirmed with imaging), with some reports of detection of the virus after cerebrospinal fluid assays although the presence of oligoclonal bands seems to be a common denominator in these patients.[86]
The virus can cause acute myocardial injury and chronic damage to the cardiovascular system.[87] An acute cardiac injury was found in 12% of infected people admitted to the hospital in Wuhan, China,[88] and is more frequent in severe disease.[89] Rates of cardiovascular symptoms are high, owing to the systemic inflammatory response and immune system disorders during disease progression, but acute myocardial injuries may also be related to ACE2 receptors in the heart.[87] ACE2 receptors are highly expressed in the heart and are involved in heart function.[87][90] A high incidence of thrombosis (31%) and venous thromboembolism (25%) have been found in ICU patients with COVID‑19 infections and may be related to poor prognosis.[91][92] Blood vessel dysfunction and clot formation (as suggested by high D-dimer levels) are thought to play a significant role in mortality, incidences of clots leading to pulmonary embolisms, and ischaemic events within the brain have been noted as complications leading to death in patients infected with SARS-CoV-2. Infection appears to set off a chain of vasoconstrictive responses within the body, constriction of blood vessels within the pulmonary circulation has also been posited as a mechanism in which oxygenation decreases alongside with the presentation of viral pneumonia.[93]
Another common cause of death is complications related to the kidneys[93]—SARS-CoV-2 directly infects kidney cells, as confirmed in post-mortem studies. Acute kidney injury is a common complication and cause of death; this is more significant in patients with already compromised kidney function, especially in people with pre-existing chronic conditions such as hypertension and diabetes which specifically cause nephropathy in the long run.[94]
Autopsies of people who died of COVID‑19 have found diffuse alveolar damage (DAD), and lymphocyte-containing inflammatory infiltrates within the lung.[95]
Immunopathology
Although SARS-COV-2 has a tropism for ACE2-expressing epithelial cells of the respiratory tract, patients with severe COVID‑19 have symptoms of systemic hyperinflammation. Clinical laboratory findings of elevated IL-2, IL-7, IL-6, granulocyte-macrophage colony-stimulating factor (GM-CSF), interferon-γ inducible protein 10 (IP-10), monocyte chemoattractant protein 1 (MCP-1), macrophage inflammatory protein 1-α (MIP-1α), and tumour necrosis factor-α (TNF-α) indicative of cytokine release syndrome (CRS) suggest an underlying immunopathology.[96]
Additionally, people with COVID‑19 and acute respiratory distress syndrome (ARDS) have classical serum biomarkers of CRS, including elevated C-reactive protein (CRP), lactate dehydrogenase (LDH), D-dimer, and ferritin.[97]
Systemic inflammation results in vasodilation, allowing inflammatory lymphocytic and monocytic infiltration of the lung and the heart. In particular, pathogenic GM-CSF-secreting T-cells were shown to correlate with the recruitment of inflammatory IL-6-secreting monocytes and severe lung pathology in COVID‑19 patients.[98] Lymphocytic infiltrates have also been reported at autopsy.[95]
Diagnosis
Main article: COVID-19 testing
Demonstration of a nasopharyngeal swab for COVID-19 testing
CDC rRT-PCR test kit for COVID-19[99]
The WHO has published several testing protocols for the disease.[100] The standard method of testing is real-time reverse transcription polymerase chain reaction (rRT-PCR).[101] The test is typically done on respiratory samples obtained by a nasopharyngeal swab; however, a nasal swab or sputum sample may also be used.[25][102] Results are generally available within a few hours to two days.[103][104] Blood tests can be used, but these require two blood samples taken two weeks apart, and the results have little immediate value.[105] Chinese scientists were able to isolate a strain of the coronavirus and publish the genetic sequence so laboratories across the world could independently develop polymerase chain reaction (PCR) tests to detect infection by the virus.[9][106][107] As of 4 April 2020, antibody tests (which may detect active infections and whether a person had been infected in the past) were in development, but not yet widely used.[108][109][110] The Chinese experience with testing has shown the accuracy is only 60 to 70%.[111] The FDA in the United States approved the first point-of-care test on 21 March 2020 for use at the end of that month.[112]
Diagnostic guidelines released by Zhongnan Hospital of Wuhan University suggested methods for detecting infections based upon clinical features and epidemiological risk. These involved identifying people who had at least two of the following symptoms in addition to a history of travel to Wuhan or contact with other infected people: fever, imaging features of pneumonia, normal or reduced white blood cell count, or reduced lymphocyte count.[113]
A study asked hospitalised COVID‑19 patients to cough into a sterile container, thus producing a saliva sample, and detected the virus in eleven of twelve patients using RT-PCR. This technique has the potential of being quicker than a swab and involving less risk to health care workers (collection at home or in the car).[64]
Along with laboratory testing, chest CT scans may be helpful to diagnose COVID-19 in individuals with a high clinical suspicion of infection but are not recommended for routine screening.[26][27] Bilateral multilobar ground-glass opacities with a peripheral, asymmetric, and posterior distribution are common in early infection.[26] Subpleural dominance, crazy paving (lobular septal thickening with variable alveolar filling), and consolidation may appear as the disease progresses.[26][114]
In late 2019, WHO assigned the emergency ICD-10 disease codes U07.1 for deaths from lab-confirmed SARS-CoV-2 infection and U07.2 for deaths from clinically or epidemiologically diagnosed COVID‑19 without lab-confirmed SARS-CoV-2 infection.[115]
Typical CT imaging findings
CT imaging of rapid progression stage
Pathology
Few data are available about microscopic lesions and the pathophysiology of COVID‑19.[116][117] The main pathological findings at autopsy are:
Macroscopy: pleurisy, pericarditis, lung consolidation and pulmonary oedema
Four types of severity of viral pneumonia can be observed:
minor pneumonia: minor serous exudation, minor fibrin exudation
mild pneumonia: pulmonary oedema, pneumocyte hyperplasia, large atypical pneumocytes, interstitial inflammation with lymphocytic infiltration and multinucleated giant cell formation
severe pneumonia: diffuse alveolar damage (DAD) with diffuse alveolar exudates. DAD is the cause of acute respiratory distress syndrome (ARDS) and severe hypoxemia.
healing pneumonia: organisation of exudates in alveolar cavities and pulmonary interstitial fibrosis
plasmocytosis in BAL[118]
Blood: disseminated intravascular coagulation (DIC);[119] leukoerythroblastic reaction[120]
Liver: microvesicular steatosis
Prevention
See also: 2019–20 coronavirus pandemic § Prevention, flatten the curve, and workplace hazard controls for COVID-19
Progressively stronger mitigation efforts to reduce the number of active cases at any given time—known as "flattening the curve"—allows healthcare services to better manage the same volume of patients.[121][122][123] Likewise, progressively greater increases in healthcare capacity—called raising the line—such as by increasing bed count, personnel, and equipment, helps to meet increased demand.[124]
Mitigation attempts that are inadequate in strictness or duration—such as premature relaxation of distancing rules or stay-at-home orders—can allow a resurgence after the initial surge and mitigation.[122][125]
Preventive measures to reduce the chances of infection include staying at home, avoiding crowded places, keeping distance from others, washing hands with soap and water often and for at least 20 seconds, practising good respiratory hygiene, and avoiding touching the eyes, nose, or mouth with unwashed hands.[126][127][128] The CDC recommends covering the mouth and nose with a tissue when coughing or sneezing and recommends using the inside of the elbow if no tissue is available.[126] Proper hand hygiene after any cough or sneeze is encouraged.[126] The CDC has recommended the use of cloth face coverings in public settings where other social distancing measures are difficult to maintain, in part to limit transmission by asymptomatic individuals.[129] The U.S. National Institutes of Health guidelines do not recommend any medication for prevention of COVID‑19, before or after exposure to the SARS-CoV-2 virus, outside of the setting of a clinical trial.[130]
Social distancing strategies aim to reduce contact of infected persons with large groups by closing schools and workplaces, restricting travel, and cancelling large public gatherings.[131] Distancing guidelines also include that people stay at least 6 feet (1.8 m) apart.[132] There is no medication known to be effective at preventing COVID‑19.[133] After the implementation of social distancing and stay-at-home orders, many regions have been able to sustain an effective transmission rate ("Rt") of less than one, meaning the disease is in remission in those areas.[134]
As a vaccine is not expected until 2021 at the earliest,[135] a key part of managing COVID‑19 is trying to decrease the epidemic peak, known as "flattening the curve".[122] This is done by slowing the infection rate to decrease the risk of health services being overwhelmed, allowing for better treatment of current cases, and delaying additional cases until effective treatments or a vaccine become available.[122][125]
According to the WHO, the use of masks is recommended only if a person is coughing or sneezing or when one is taking care of someone with a suspected infection.[136] For the European Centre for Disease Prevention and Control (ECDC) face masks "... could be considered especially when visiting busy closed spaces ..." but "... only as a complementary measure ..."[137] Several countries have recommended that healthy individuals wear face masks or cloth face coverings (like scarves or bandanas) at least in certain public settings, including China,[138] Hong Kong,[139] Spain,[140] Italy (Lombardy region),[141] and the United States.[129]
Those diagnosed with COVID‑19 or who believe they may be infected are advised by the CDC to stay home except to get medical care, call ahead before visiting a healthcare provider, wear a face mask before entering the healthcare provider's office and when in any room or vehicle with another person, cover coughs and sneezes with a tissue, regularly wash hands with soap and water and avoid sharing personal household items.[30][142] The CDC also recommends that individuals wash hands often with soap and water for at least 20 seconds, especially after going to the toilet or when hands are visibly dirty, before eating and after blowing one's nose, coughing or sneezing. It further recommends using an alcohol-based hand sanitiser with at least 60% alcohol, but only when soap and water are not readily available.[126]
For areas where commercial hand sanitisers are not readily available, the WHO provides two formulations for local production. In these formulations, the antimicrobial activity arises from ethanol or isopropanol. Hydrogen peroxide is used to help eliminate bacterial spores in the alcohol; it is "not an active substance for hand antisepsis". Glycerol is added as a humectant.[143]
Prevention efforts are multiplicative, with effects far beyond that of a single spread. Each avoided case leads to more avoided cases down the line, which in turn can stop the outbreak in its tracks.
File:COVID19 W ENG.ogv
Handwashing instructions
Management
People are managed with supportive care, which may include fluid therapy, oxygen support, and supporting other affected vital organs.[144][145][146] The CDC recommends that those who suspect they carry the virus wear a simple face mask.[30] Extracorporeal membrane oxygenation (ECMO) has been used to address the issue of respiratory failure, but its benefits are still under consideration.[41][147] Personal hygiene and a healthy lifestyle and diet have been recommended to improve immunity.[148] Supportive treatments may be useful in those with mild symptoms at the early stage of infection.[149]
The WHO, the Chinese National Health Commission, and the United States' National Institutes of Health have published recommendations for taking care of people who are hospitalised with COVID‑19.[130][150][151] Intensivists and pulmonologists in the U.S. have compiled treatment recommendations from various agencies into a free resource, the IBCC.[152][153]
Medications
See also: Coronavirus disease 2019 § Research
As of April 2020, there is no specific treatment for COVID‑19.[6][133] Research is, however, ongoing. For symptoms, some medical professionals recommend paracetamol (acetaminophen) over ibuprofen for first-line use.[154][155][156] The WHO and NIH do not oppose the use of non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen for symptoms,[130][157] and the FDA says currently there is no evidence that NSAIDs worsen COVID‑19 symptoms.[158]
While theoretical concerns have been raised about ACE inhibitors and angiotensin receptor blockers, as of 19 March 2020, these are not sufficient to justify stopping these medications.[130][159][160][161] Steroids, such as methylprednisolone, are not recommended unless the disease is complicated by acute respiratory distress syndrome.[162][163]
Medications to prevent blood clotting have been suggested for treatment,[91] and anticoagulant therapy with low molecular weight heparin appears to be associated with better outcomes in severe COVID‐19 showing signs of coagulopathy (elevated D-dimer).[164]
Protective equipment
See also: COVID-19 related shortages
The CDC recommends four steps to putting on personal protective equipment (PPE).[165]
Precautions must be taken to minimise the risk of virus transmission, especially in healthcare settings when performing procedures that can generate aerosols, such as intubation or hand ventilation.[166] For healthcare professionals caring for people with COVID‑19, the CDC recommends placing the person in an Airborne Infection Isolation Room (AIIR) in addition to using standard precautions, contact precautions, and airborne precautions.[167]
The CDC outlines the guidelines for the use of personal protective equipment (PPE) during the pandemic. The recommended gear is a PPE gown, respirator or facemask, eye protection, and medical gloves.[168][169]
When available, respirators (instead of facemasks) are preferred.[170] N95 respirators are approved for industrial settings but the FDA has authorised the masks for use under an Emergency Use Authorisation (EUA). They are designed to protect from airborne particles like dust but effectiveness against a specific biological agent is not guaranteed for off-label uses.[171] When masks are not available, the CDC recommends using face shields or, as a last resort, homemade masks.[172]
Mechanical ventilation
Most cases of COVID‑19 are not severe enough to require mechanical ventilation or alternatives, but a percentage of cases are.[173][174] The type of respiratory support for individuals with COVID‑19 related respiratory failure is being actively studied for people in the hospital, with some evidence that intubation can be avoided with a high flow nasal cannula or bi-level positive airway pressure.[175] Whether either of these two leads to the same benefit for people who are critically ill is not known.[176] Some doctors prefer staying with invasive mechanical ventilation when available because this technique limits the spread of aerosol particles compared to a high flow nasal cannula.[173]
Severe cases are most common in older adults (those older than 60 years,[173] and especially those older than 80 years).[177] Many developed countries do not have enough hospital beds per capita, which limits a health system's capacity to handle a sudden spike in the number of COVID‑19 cases severe enough to require hospitalisation.[178] This limited capacity is a significant driver behind calls to flatten the curve.[178] One study in China found 5% were admitted to intensive care units, 2.3% needed mechanical support of ventilation, and 1.4% died.[41] In China, approximately 30% of people in hospital with COVID‑19 are eventually admitted to ICU.[4]
Acute respiratory distress syndrome
Main article: Acute respiratory distress syndrome
Mechanical ventilation becomes more complex as acute respiratory distress syndrome (ARDS) develops in COVID‑19 and oxygenation becomes increasingly difficult.[179] Ventilators capable of pressure control modes and high PEEP[180] are needed to maximise oxygen delivery while minimising the risk of ventilator-associated lung injury and pneumothorax.[181] High PEEP may not be available on older ventilators.
Options for ARDS[179]
TherapyRecommendations
High-flow nasal oxygenFor SpO2 <93%. May prevent the need for intubation and ventilation
Tidal volume6mL per kg and can be reduced to 4mL/kg
Plateau airway pressureKeep below 30 cmH2O if possible (high respiratory rate (35 per minute) may be required)
Positive end-expiratory pressureModerate to high levels
Prone positioningFor worsening oxygenation
Fluid managementGoal is a negative balance of 0.5–1.0L per day
AntibioticsFor secondary bacterial infections
GlucocorticoidsNot recommended
Experimental treatment
See also: § Research
Research into potential treatments started in January 2020,[182] and several antiviral drugs are in clinical trials.[183][184] Remdesivir appears to be the most promising.[133] Although new medications may take until 2021 to develop,[185] several of the medications being tested are already approved for other uses or are already in advanced testing.[186] Antiviral medication may be tried in people with severe disease.[144] The WHO recommended volunteers take part in trials of the effectiveness and safety of potential treatments.[187]
The FDA has granted temporary authorisation to convalescent plasma as an experimental treatment in cases where the person's life is seriously or immediately threatened. It has not undergone the clinical studies needed to show it is safe and effective for the disease.[188][189][190]
Information technology
See also: Contact tracing and Government by algorithm
In February 2020, China launched a mobile app to deal with the disease outbreak.[191] Users are asked to enter their name and ID number. The app can detect 'close contact' using surveillance data and therefore a potential risk of infection. Every user can also check the status of three other users. If a potential risk is detected, the app not only recommends self-quarantine, it also alerts local health officials.[192]
Big data analytics on cellphone data, facial recognition technology, mobile phone tracking, and artificial intelligence are used to track infected people and people whom they contacted in South Korea, Taiwan, and Singapore.[193][194] In March 2020, the Israeli government enabled security agencies to track mobile phone data of people supposed to have coronavirus. The measure was taken to enforce quarantine and protect those who may come into contact with infected citizens.[195] Also in March 2020, Deutsche Telekom shared aggregated phone location data with the German federal government agency, Robert Koch Institute, to research and prevent the spread of the virus.[196] Russia deployed facial recognition technology to detect quarantine breakers.[197] Italian regional health commissioner Giulio Gallera said he has been informed by mobile phone operators that "40% of people are continuing to move around anyway".[198] German government conducted a 48 hours weekend hackathon with more than 42.000 participants.[199][200] Two million people in the UK used an app developed in March 2020 by King's College London and Zoe to track people with COVID‑19 symptoms.[201] Also, the president of Estonia, Kersti Kaljulaid, made a global call for creative solutions against the spread of coronavirus.[202]
Psychological support
See also: Mental health during the 2019–20 coronavirus pandemic
Individuals may experience distress from quarantine, travel restrictions, side effects of treatment, or fear of the infection itself. To address these concerns, the National Health Commission of China published a national guideline for psychological crisis intervention on 27 January 2020.[203][204]
The Lancet published a 14-page call for action focusing on the UK and stated conditions were such that a range of mental health issues was likely to become more common. BBC quoted Rory O'Connor in saying, "Increased social isolation, loneliness, health anxiety, stress and an economic downturn are a perfect storm to harm people's mental health and wellbeing."[205][206]
Prognosis
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The severity of diagnosed cases in China
The severity of diagnosed COVID-19 cases in China[207]
Case fatality rates for COVID-19 by age by country.
Case fatality rates by age group:
China, as of 11 February 2020[208]
South Korea, as of 15 April 2020[209]
Spain, as of 24 April 2020[210]
Italy, as of 23 April 2020[211]
Case fatality rate depending on other health problems
Case fatality rate in China depending on other health problems. Data through 11 February 2020.[208]
Case fatality rate by country and number of cases
The number of deaths vs total cases by country and approximate case fatality rate[212]
The severity of COVID‑19 varies. The disease may take a mild course with few or no symptoms, resembling other common upper respiratory diseases such as the common cold. Mild cases typically recover within two weeks, while those with severe or critical diseases may take three to six weeks to recover. Among those who have died, the time from symptom onset to death has ranged from two to eight weeks.[47]
Children make up a small proportion of reported cases, with about 1% of cases being under 10 years, and 4% aged 10-19 years.[22] They are likely to have milder symptoms and a lower chance of severe disease than adults; in those younger than 50 years, the risk of death is less than 0.5%, while in those older than 70 it is more than 8%.[213][214][215] Pregnant women may be at higher risk for severe infection with COVID-19 based on data from other similar viruses, like SARS and MERS, but data for COVID-19 is lacking.[216][217] In China, children acquired infections mainly through close contact with their parents or other family members who lived in Wuhan or had traveled there.[213]
In some people, COVID‑19 may affect the lungs causing pneumonia. In those most severely affected, COVID-19 may rapidly progress to acute respiratory distress syndrome (ARDS) causing respiratory failure, septic shock, or multi-organ failure.[218][219] Complications associated with COVID‑19 include sepsis, abnormal clotting, and damage to the heart, kidneys, and liver. Clotting abnormalities, specifically an increase in prothrombin time, have been described in 6% of those admitted to hospital with COVID-19, while abnormal kidney function is seen in 4% of this group.[220] Approximately 20-30% of people who present with COVID‑19 demonstrate elevated liver enzymes (transaminases).[133] Liver injury as shown by blood markers of liver damage is frequently seen in severe cases.[221]
Some studies have found that the neutrophil to lymphocyte ratio (NLR) may be helpful in early screening for severe illness.[222]
Most of those who die of COVID‑19 have pre-existing (underlying) conditions, including hypertension, diabetes mellitus, and cardiovascular disease.[223] The Istituto Superiore di Sanità reported that out of 8.8% of deaths where medical charts were available for review, 97.2% of sampled patients had at least one comorbidity with the average patient having 2.7 diseases.[224] According to the same report, the median time between the onset of symptoms and death was ten days, with five being spent hospitalised. However, patients transferred to an ICU had a median time of seven days between hospitalisation and death.[224] In a study of early cases, the median time from exhibiting initial symptoms to death was 14 days, with a full range of six to 41 days.[225] In a study by the National Health Commission (NHC) of China, men had a death rate of 2.8% while women had a death rate of 1.7%.[226] Histopathological examinations of post-mortem lung samples show diffuse alveolar damage with cellular fibromyxoid exudates in both lungs. Viral cytopathic changes were observed in the pneumocytes. The lung picture resembled acute respiratory distress syndrome (ARDS).[47] In 11.8% of the deaths reported by the National Health Commission of China, heart damage was noted by elevated levels of troponin or cardiac arrest.[49] According to March data from the United States, 89% of those hospitalised had preexisting conditions.[227]
The availability of medical resources and the socioeconomics of a region may also affect mortality.[228] Estimates of the mortality from the condition vary because of those regional differences,[229] but also because of methodological difficulties. The under-counting of mild cases can cause the mortality rate to be overestimated.[230] However, the fact that deaths are the result of cases contracted in the past can mean the current mortality rate is underestimated.[231][232] Smokers were 1.4 times more likely to have severe symptoms of COVID‑19 and approximately 2.4 times more likely to require intensive care or die compared to non-smokers.[233]
Concerns have been raised about long-term sequelae of the disease. The Hong Kong Hospital Authority found a drop of 20% to 30% in lung capacity in some people who recovered from the disease, and lung scans suggested organ damage.[234] This may also lead to post-intensive care syndrome following recovery.[235]
Case fatality rates (%) by age and country
Age0–910–1920–2930–3940–4950–5960–6970–7980-8990+
China as of 11 February[208]0.00.20.20.20.41.33.68.014.8
Denmark as of 25 April[236]0.24.515.524.940.7
Italy as of 23 April[211]0.20.00.10.40.92.610.024.930.826.1
Netherlands as of 17 April[237]0.00.30.10.20.51.57.623.230.029.3
Portugal as of 24 April[238]0.00.00.00.00.30.62.88.516.5
S. Korea as of 15 April[209]0.00.00.00.10.20.72.59.722.2
Spain as of 24 April[210]0.30.40.30.30.61.34.413.220.320.1
Switzerland as of 25 April[239]0.90.00.00.10.00.52.710.124.0
Case fatality rates (%) by age in the United States
Age0–1920–4445–5455–6465–7475–8485+
United States as of 16 March[240]0.00.1–0.20.5–0.81.4–2.62.7–4.94.3–10.510.4–27.3
Note: The lower bound includes all cases. The upper bound excludes cases that were missing data.
Estimate of infection fatality rates and probability of severe disease course (%) by age based on cases from China[241]
0–910–1920–2930–3940–4950–5960–6970–7980+
Severe disease0.0
(0.0–0.0)0.04
(0.02–0.08)1.0
(0.62–2.1)3.4
(2.0–7.0)4.3
(2.5–8.7)8.2
(4.9–17)11
(7.0–24)17
(9.9–34)18
(11–38)
Death0.0016
(0.00016–0.025)0.0070
(0.0015–0.050)0.031
(0.014–0.092)0.084
(0.041–0.19)0.16
(0.076–0.32)0.60
(0.34–1.3)1.9
(1.1–3.9)4.3
(2.5–8.4)7.8
(3.8–13)
Total infection fatality rate is estimated to be 0.66% (0.39–1.3). Infection fatality rate is fatality per all infected individuals, regardless of whether they were diagnosed or had any symptoms. Numbers in parentheses are 95% credible intervals for the estimates.
Reinfection
As of March 2020, it was unknown if past infection provides effective and long-term immunity in people who recover from the disease.[242] Immunity is seen as likely, based on the behaviour of other coronaviruses,[243] but cases in which recovery from COVID‑19 have been followed by positive tests for coronavirus at a later date have been reported.[244][245][246][247] These cases are believed to be worsening of a lingering infection rather than re-infection.[247]
History
Main article: Timeline of the 2019–20 coronavirus pandemic
The virus is thought to be natural and has an animal origin,[77] through spillover infection.[248] The actual origin is unknown, but by December 2019 the spread of infection was almost entirely driven by human-to-human transmission.[208][249] A study of the first 41 cases of confirmed COVID‑19, published in January 2020 in The Lancet, revealed the earliest date of onset of symptoms as 1 December 2019.[250][251][252] Official publications from the WHO reported the earliest onset of symptoms as 8 December 2019.[253] Human-to-human transmission was confirmed by the WHO and Chinese authorities by 20 January 2020.[254][255]
Epidemiology
Main article: 2019–20 coronavirus pandemic
Several measures are commonly used to quantify mortality.[256] These numbers vary by region and over time and are influenced by the volume of testing, healthcare system quality, treatment options, time since the initial outbreak, and population characteristics such as age, sex, and overall health.[257]
The death-to-case ratio reflects the number of deaths divided by the number of diagnosed cases within a given time interval. Based on Johns Hopkins University statistics, the global death-to-case ratio is 7.0% (203,044/2,899,830) as of 26 April 2020.[7] The number varies by region.[258]
Other measures include the case fatality rate (CFR), which reflects the percent of diagnosed individuals who die from a disease, and the infection fatality rate (IFR), which reflects the percent of infected individuals (diagnosed and undiagnosed) who die from a disease. These statistics are not time-bound and follow a specific population from infection through case resolution. Many academics have attempted to calculate these numbers for specific populations.[259]
Total confirmed cases over time
Total deaths over time
Total confirmed cases of COVID‑19 per million people, 10 April 2020[260]
Total confirmed deaths due to COVID‑19 per million people, 10 April 2020[261]
Infection fatality rate
Our World in Data states that as of March 25, 2020, the infection fatality rate (IFR) cannot be accurately calculated.[262] In February, the World Health Organization estimated the IFR at 0.94%, with a confidence interval between 0.37 percent to 2.9 percent.[263] The University of Oxford Centre for Evidence-Based Medicine (CEBM) estimated a global CFR of 0.72 percent and IFR of 0.1 percent to 0.36 percent.[264] According to CEBM, random antibody testing in Germany suggested an IFR of 0.37 percent there.[264] Firm lower limits to local infection fatality rates were established, such as in Bergamo province, where 0.57% of the population has died, leading to a minimum IFR of 0.57% in the province. This population fatality rate (PFR) minimum increases as more people get infected and run through their disease.[265][266] Similarly, as of April 22 in the New York City area, there were 15,411 deaths confirmed from COVID-19, and 19,200 excess deaths.[267] Very recently, the first results of antibody testing have come in, but there are no valid scientific reports based on them available yet. A Bloomberg Opinion piece provides a survey.[268][269]
Sex differences
Main article: Gendered impact of the 2019–20 coronavirus pandemic
The impact of the pandemic and its mortality rate are different for men and women.[270] Mortality is higher in men in studies conducted in China and Italy.[271][272][273] The highest risk for men is in their 50s, with the gap between men and women closing only at 90.[273] In China, the death rate was 2.8 percent for men and 1.7 percent for women.[273] The exact reasons for this sex-difference are not known, but genetic and behavioural factors could be a reason.[270] Sex-based immunological differences, a lower prevalence of smoking in women, and men developing co-morbid conditions such as hypertension at a younger age than women could have contributed to the higher mortality in men.[273] In Europe, of those infected with COVID‑19, 57% were men; of those infected with COVID‑19 who also died, 72% were men.[274] As of April 2020, the U.S. government is not tracking sex-related data of COVID‑19 infections.[275] Research has shown that viral illnesses like Ebola, HIV, influenza, and SARS affect men and women differently.[275] A higher percentage of health workers, particularly nurses, are women, and they have a higher chance of being exposed to the virus.[276] School closures, lockdowns, and reduced access to healthcare following the 2019–20 coronavirus pandemic may differentially affect the genders and possibly exaggerate existing gender disparity.[270][277]
Society and culture
Name
During the initial outbreak in Wuhan, China, the virus and disease were commonly referred to as "coronavirus" and "Wuhan coronavirus",[278][279][280] with the disease sometimes called "Wuhan pneumonia".[281][282] In the past, many diseases have been named after geographical locations, such as the Spanish flu,[283] Middle East Respiratory Syndrome, and Zika virus.[284]
In January 2020, the World Health Organisation recommended 2019-nCov[285] and 2019-nCoV acute respiratory disease[286] as interim names for the virus and disease per 2015 guidance and international guidelines against using geographical locations (e.g. Wuhan, China), animal species or groups of people in disease and virus names to prevent social stigma.[287][288][289]
The official names COVID‑19 and SARS-CoV-2 were issued by the WHO on 11 February 2020.[290] WHO chief Tedros Adhanom Ghebreyesus explained: CO for corona, VI for virus, D for disease and 19 for when the outbreak was first identified (31 December 2019).[291] The WHO additionally uses "the COVID‑19 virus" and "the virus responsible for COVID‑19" in public communications.[290] Both the disease and virus are commonly referred to as "coronavirus" in the media and public discourse.
Misinformation
Main article: Misinformation related to the 2019–20 coronavirus pandemic
After the initial outbreak of COVID‑19, conspiracy theories, misinformation, and disinformation emerged regarding the origin, scale, prevention, treatment, and other aspects of the disease and rapidly spread online.[292][293][294][295]
Protests
Beginning April 17, 2020, news media began reporting on a wave of demonstrations protesting against state-mandated quarantine restrictions in in Michigan, Ohio, and Kentucky.[296][297]
Other animals
Humans appear to be capable of spreading the virus to some other animals. A domestic cat in Liège, Belgium, tested positive after it started showing symptoms (diarrhoea, vomiting, shortness of breath) a week later than its owner, who was also positive.[298] Tigers at the Bronx Zoo in New York, United States, tested positive for the virus and showed symptoms of COVID‑19, including a dry cough and loss of appetite.[299]
A study on domesticated animals inoculated with the virus found that cats and ferrets appear to be "highly susceptible" to the disease, while dogs appear to be less susceptible, with lower levels of viral replication. The study failed to find evidence of viral replication in pigs, ducks, and chickens.[300]
Research
Main article: COVID-19 drug development
No medication or vaccine is approved to treat the disease.[186] International research on vaccines and medicines in COVID‑19 is underway by government organisations, academic groups, and industry researchers.[301][302] In March, the World Health Organisation initiated the "SOLIDARITY Trial" to assess the treatment effects of four existing antiviral compounds with the most promise of efficacy.[303]
Vaccine
Main article: COVID-19 vaccine
There is no available vaccine, but various agencies are actively developing vaccine candidates. Previous work on SARS-CoV is being used because both SARS-CoV and SARS-CoV-2 use the ACE2 receptor to enter human cells.[304] Three vaccination strategies are being investigated. First, researchers aim to build a whole virus vaccine. The use of such a virus, be it inactive or dead, aims to elicit a prompt immune response of the human body to a new infection with COVID‑19. A second strategy, subunit vaccines, aims to create a vaccine that sensitises the immune system to certain subunits of the virus. In the case of SARS-CoV-2, such research focuses on the S-spike protein that helps the virus intrude the ACE2 enzyme receptor. A third strategy is that of the nucleic acid vaccines (DNA or RNA vaccines, a novel technique for creating a vaccination). Experimental vaccines from any of these strategies would have to be tested for safety and efficacy.[305]
On 16 March 2020, the first clinical trial of a vaccine started with four volunteers in Seattle, United States. The vaccine contains a harmless genetic code copied from the virus that causes the disease.[306]
Antibody-dependent enhancement has been suggested as a potential challenge for vaccine development for SARS-COV-2, but this is controversial.[307]
Medications
Main article: COVID-19 drug repurposing research
At least 29 phase II–IV efficacy trials in COVID‑19 were concluded in March 2020 or scheduled to provide results in April from hospitals in China.[308][309] There are more than 300 active clinical trials underway as of April 2020.[133] Seven trials were evaluating already approved treatments, including four studies on hydroxychloroquine or chloroquine.[309] Repurposed antiviral drugs make up most of the Chinese research, with nine phase III trials on remdesivir across several countries due to report by the end of April.[308][309] Other candidates in trials include vasodilators, corticosteroids, immune therapies, lipoic acid, bevacizumab, and recombinant angiotensin-converting enzyme 2.[309]
The COVID‑19 Clinical Research Coalition has goals to 1) facilitate rapid reviews of clinical trial proposals by ethics committees and national regulatory agencies, 2) fast-track approvals for the candidate therapeutic compounds, 3) ensure standardised and rapid analysis of emerging efficacy and safety data and 4) facilitate sharing of clinical trial outcomes before publication.[310][311]
Several existing medications are being evaluated for the treatment of COVID‑19,[186] including remdesivir, chloroquine, hydroxychloroquine, lopinavir/ritonavir, and lopinavir/ritonavir combined with interferon beta.[303][312] There is tentative evidence for efficacy by remdesivir, as of March 2020.[313][314] Clinical improvement was observed in patients treated with compassionate-use remdesivir.[315] Remdesivir inhibits SARS-CoV-2 in vitro.[316] Phase III clinical trials are underway in the U.S., China, and Italy.[186][308][317]
In 2020, a trial found that lopinavir/ritonavir was ineffective in the treatment of severe illness.[318] Nitazoxanide has been recommended for further in vivo study after demonstrating low concentration inhibition of SARS-CoV-2.[316]
There are mixed results as of 3 April 2020 as to the effectiveness of hydroxychloroquine as a treatment for COVID‑19, with some studies showing little or no improvement.[319][320] The studies of chloroquine and hydroxychloroquine with or without azithromycin have major limitations that have prevented the medical community from embracing these therapies without further study.[133]
Oseltamivir does not inhibit SARS-CoV-2 in vitro and has no known role in COVID‑19 treatment.[133]
Anti-cytokine storm
Cytokine release syndrome (CRS) can be a complication in the later stages of severe COVID‑19. There is preliminary evidence that hydroxychloroquine may have anti-cytokine storm properties.[321]
Tocilizumab has been included in treatment guidelines by China's National Health Commission after a small study was completed.[322][323] It is undergoing a phase 2 non-randomised trial at the national level in Italy after showing positive results in people with severe disease.[324][325] Combined with a serum ferritin blood test to identify cytokine storms, it is meant to counter such developments, which are thought to be the cause of death in some affected people.[326][327][328] The interleukin-6 receptor antagonist was approved by the FDA to undergo a phase III clinical trial assessing the medication's impact on COVID‑19 based on retrospective case studies for the treatment of steroid-refractory cytokine release syndrome induced by a different cause, CAR T cell therapy, in 2017.[329] To date, there is no randomised, controlled evidence that tocilizumab is an efficacious treatment for CRS. Prophylactic tocilizumab has been shown to increase serum IL-6 levels by saturating the IL-6R, driving IL-6 across the blood-brain barrier, and exacerbating neurotoxicity while having no impact on the incidence of CRS.[330]
Lenzilumab, an anti-GM-CSF monoclonal antibody, is protective in murine models for CAR T cell-induced CRS and neurotoxicity and is a viable therapeutic option due to the observed increase of pathogenic GM-CSF secreting T-cells in hospitalised patients with COVID‑19.[331]
The Feinstein Institute of Northwell Health announced in March a study on "a human antibody that may prevent the activity" of IL-6.[332]
Passive antibodies
Transferring purified and concentrated antibodies produced by the immune systems of those who have recovered from COVID‑19 to people who need them is being investigated as a non-vaccine method of passive immunisation.[333] This strategy was tried for SARS with inconclusive results.[333] Viral neutralisation is the anticipated mechanism of action by which passive antibody therapy can mediate defence against SARS-CoV-2. Other mechanisms, however, such as antibody-dependent cellular cytotoxicity and/or phagocytosis, may be possible.[333] Other forms of passive antibody therapy, for example, using manufactured monoclonal antibodies, are in development.[333] Production of convalescent serum, which consists of the liquid portion of the blood from recovered patients and contains antibodies specific to this virus, could be increased for quicker deployment.[334]
Persistent URL: floridamemory.com/items/show/74956
Local call number: C026328
Title: Floating Christmas tree - Fort Lauderdale
Date: December 1957
Physical descrip: 1 photoprint - b&w - 4 x 5 in.
Series Title: Department of Commerce Collection
Repository: State Library and Archives of Florida
500 S. Bronough St., Tallahassee, FL, 32399-0250 USA, Contact: 850.245.6700, Archives@dos.myflorida.com
Bain News Service,, publisher.
[Men playing chess]
[between ca. 1920 and ca. 1925]
1 negative : glass ; 5 x 7 in. or smaller.
Notes:
Title from unverified data provided by the Bain News Service on the negatives or caption cards.
Forms part of: George Grantham Bain Collection (Library of Congress).
Format: Glass negatives.
Rights Info: No known restrictions on publication. For more information, see George Grantham Bain Collection - Rights and Restrictions Information www.loc.gov/rr/print/res/274_bain.html
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
Part Of: Bain News Service photograph collection (DLC) 2005682517
General information about the George Grantham Bain Collection is available at hdl.loc.gov/loc.pnp/pp.ggbain
Higher resolution image is available (Persistent URL): hdl.loc.gov/loc.pnp/ggbain.33886
Call Number: LC-B2- 5672-14
Persistent URL: www.floridamemory.com/items/show/35723
Local call number: rc13388
Title: Ricou Browning in his movie costume at Wakulla Springs
Date: ca 1953
Physical descrip: 1 photoprint - b&w - 10 x 8 in.
Series Title: Reference Collection
Repository: State Library and Archives of Florida, 500 S. Bronough St., Tallahassee, FL 32399-0250 USA. Contact: 850.245.6700. Archives@dos.myflorida.com
A couple of MRL EMDs idle in Livingston with a variety of power from the new landlord, BNSF. March 2025.
Bain News Service,, publisher.
Mrs. Wendell Phillips
[between ca. 1920 and ca. 1925]
1 negative : glass ; 5 x 7 in. or smaller.
Notes:
Title from unverified data provided by the Bain News Service on the negatives or caption cards.
Forms part of: George Grantham Bain Collection (Library of Congress).
Format: Glass negatives.
Rights Info: No known restrictions on publication. For more information, see George Grantham Bain Collection - Rights and Restrictions Information www.loc.gov/rr/print/res/274_bain.html
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
Part Of: Bain News Service photograph collection (DLC) 2005682517
General information about the George Grantham Bain Collection is available at hdl.loc.gov/loc.pnp/pp.ggbain
Higher resolution image is available (Persistent URL): hdl.loc.gov/loc.pnp/ggbain.32286
Call Number: LC-B2- 5448-2
Persistent URL: www.floridamemory.com/items/show/30697
Local call number: RC07613
Title: Fokker tri-motor airplane-Miami
Date: December 20, 1925
Physical descrip: 1 photoprint - b&w - 8 x 10 in.
Series Title: Reference Collection
Repository: State Library and Archives of Florida, 500 S. Bronough St., Tallahassee, FL 32399-0250 USA. Contact: 850.245.6700. Archives@dos.myflorida.com
Persistent URL: floridamemory.com/items/show/84311
Local call number: C672755
Title: Mansion at Parrish Park - Titusville
Date: 1967
Physical descrip: 1 photoprint - b&w - 4 x 5 in.
Series Title: Department of Commerce Collection
Repository: State Library and Archives of Florida
500 S. Bronough St., Tallahassee, FL, 32399-0250 USA, Contact: 850.245.6700, Archives@dos.myflorida.com
Persistent URL: digital.lib.muohio.edu/u?/tradecards,734
Subject (TGM): Butterflies; Household soap; Cosmetics & soap; Chemical industry;
BBC Weather - 31.01.14
A cold frosty start with some fog patches. It will soon turn windy with gales along coasts and high ground. Rain spreading eastwards, reaching all parts by lunchtime will be persistent for many.
Goodbye January :)
Persistent URL: digital.lib.muohio.edu/u?/tradecards,4454
Subject (TGM): Sewing machines; Sewing machine industry; Sewing equipment & supplies; Appliances; Appliance stores; Children sewing; Girls;
Bain News Service,, publisher.
Jap[anese] machine gun
[1924 Dec.] (date created or published later by Bain)
1 negative : glass ; 5 x 7 in. or smaller.
Notes:
Title and date from unverified data provided by the Bain News Service on the negative.
Forms part of: George Grantham Bain Collection (Library of Congress).
Format: Glass negatives.
Rights Info: No known restrictions on publication. For more information, see George Grantham Bain Collection - Rights and Restrictions Information www.loc.gov/rr/print/res/274_bain.html
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
Part Of: Bain News Service photograph collection (DLC) 2005682517
General information about the George Grantham Bain Collection is available at hdl.loc.gov/loc.pnp/pp.ggbain
Higher resolution image is available (Persistent URL): hdl.loc.gov/loc.pnp/ggbain.37776
Call Number: LC-B2- 6299-12
Delano, Jack,, photographer.
General view of part of the South Water street freight depot of the Illinois Central Railroad, Chicago, Ill. A C and O R.R. caboose. the C and O is one of the railroads that lease terminal facilities from the I.C.R.R
1943 April
1 transparency : color.
Notes:
Title from FSA or OWI agency caption.
Transfer from U.S. Office of War Information, 1944.
Subjects:
Illinois Central Railroad
World War, 1939-1945
Railroad cabooses
Railroad stations
United States--Illinois--Chicago
Format: Transparencies--Color
Rights Info: No known restrictions on publication.
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
Part Of: Farm Security Administration - Office of War Information Collection 12002-11 (DLC) 93845501
General information about the FSA/OWI Color Photographs is available at hdl.loc.gov/loc.pnp/pp.fsac
Higher resolution image is available (Persistent URL): hdl.loc.gov/loc.pnp/fsac.1a34777
Call Number: LC-USW36-595
Persistent URL: floridamemory.com/items/show/136
Local call number: PR00136
Title: Bellowing alligator - Homosassa Springs
Date: ca. 1955
Physical descrip: 1 photograph - b&w - 10 x 8 in.
Series Title: Print Collections
Repository: State Library and Archives of Florida
500 S. Bronough St., Tallahassee, FL, 32399-0250 USA, Contact: 850.245.6700, Archives@dos.myflorida.com
Original Caption: Scene In South Side Chicago On 47th Street, A Busy Thoroughfare Where Many Small Black Businesses Are Located Many Of The City's Black Business Owners Started With Small Operations And Grew With Hard Work. Today Chicago Is Believed To Be The Black Business Capital Of The United States. Census Figures In 1970 Noted That 8,747 Black Owned Businesses Were In Operation In Chicago And Grossed More Than $332 Million, 06/1973
U.S. National Archives’ Local Identifier: 412-DA-13772
Photographer: White, John H, 1945-
Subjects:
African-American
Chicago (Cook county, Illinois, United States)
Environmental Protection Agency
Project DOCUMERICA
Persistent URL:
catalog.archives.gov/id/556224
Repository: Still Picture Records Section, Special Media Archives Services Division (NWCS-S), National Archives at College Park, 8601 Adelphi Road, College Park, MD, 20740-6001.
For information about ordering reproductions of photographs held by the Still Picture Unit, visit: www.archives.gov/research/order/still-pictures.html
Reproductions may be ordered via an independent vendor. NARA maintains a list of vendors at www.archives.gov/research/order/vendors-photos-maps-dc.html
Access Restrictions: Unrestricted
Use Restrictions: Unrestricted
Persistent URL: digital.lib.muohio.edu/u?/tradecards,3128
Subject (TGM): Thread industry; Sewing equipment & supplies; Cats; Animals in human situations;
Here he is again, he'll do anything to get at those seeds, as you can see he's still keeping a close
eye on me & me on him! He'll even hang upside down on this feeder! Poor birds don't have a
chance at their own food! LoL!!!
Persistent URL: digital.lib.muohio.edu/u?/tradecards,1178
Subject (TGM): Typewriters; Stores & shops; Machinery industry;
Persistent URL: www.floridamemory.com/items/show253128
Title: Food for Tomorrow's World
Date of film: ca. 1960
Physical descrip: b&w; sound; original length: 20.00
Local call number: V-42 BA124; S. 828
General note: This film shows the work at Hydroponics International where the "farmers" carry walkie-talkie radios and have an extensive lab to develop and test mineral solutions that modify the soil and result in optimum produce. Viewers see shots of a two-foot long bean developed here, as well as tobacco, ornamentals, vegetables and fruits. The produce was packed under the name "Vita-Veg."
To see full-length versions of this and other videos from the State Archives of Florida, visit www.floridamemory.com/video/.
Repository: State Library and Archives of Florida, 500 S. Bronough St., Tallahassee, FL 32399-0250 USA. Contact: 850.245.6700. Archives@dos.myflorida.com
Bain News Service,, publisher.
Stokowski
[between ca. 1920 and ca. 1925]
1 negative : glass ; 5 x 7 in. or smaller.
Notes:
Photograph shows British conductor Leopold Anthony Stokowski (1882-1977).
Title from data provided by the Bain News Service on the negative.
Forms part of: George Grantham Bain Collection (Library of Congress).
Format: Glass negatives.
Rights Info: No known restrictions on publication. For more information, see George Grantham Bain Collection - Rights and Restrictions Information www.loc.gov/rr/print/res/274_bain.html
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
Part Of: Bain News Service photograph collection (DLC) 2005682517
General information about the George Grantham Bain Collection is available at hdl.loc.gov/loc.pnp/pp.ggbain
Higher resolution image is available (Persistent URL): hdl.loc.gov/loc.pnp/ggbain.35519
Call Number: LC-B2- 5925-2
Persistent URL: digital.lib.muohio.edu/u?/tradecards,2429
Subject (TGM): Roses; Flowers; Perfumes; Pharmacists; Drugstores;
Persistent URL: digital.lib.muohio.edu/u?/tradecards,404
Subject (TGM): Frogs; Amphibians; Flutes; Musical instruments; Animals in human situations; Cosmetics & soap; Chemical industry;
Persistent URL: floridamemory.com/items/show/69771
Local call number: C013170
Title: Jean King and Ann Babel on a control tower at Bahia-Mar Yacht Basin - Fort Lauderdale
Date: April 1950
Physical descrip: 1 photoprint - b&w - 5 x 4 in.
Series Title: Department of Commerce Collection
Repository: State Library and Archives of Florida
500 S. Bronough St., Tallahassee, FL, 32399-0250 USA, Contact: 850.245.6700, Archives@dos.myflorida.com
这就是小雁塔及其周围的风景。如果您以后有时间，欢迎来这里参观游玩。
Must be underderstand from far away trought stranger but....A third condition is that the type of imagination must be persistent through fairly long periods of time, otherwise not only will there be an absence of sufficient feeling or momentum to cause the myths to be repeated and kept alive and transmitted to posterity, but the inducement to add to them and so enable them to mature and become complete and finished off and sufficiently attractive to Page 67appeal to the human mind in spite of the foreign character they often bear will be lacking. In other words, myths and legends grow. They resemble not so much the narrative of the story-teller or novelist as a gradually developing art like music, or a body of ideas like philosophy. They are human and natural, though they express the thought not of any one individual mind, but of the folk-soul, exemplifying in poetical form some great psychological or physiographical truth.Apart from this, the influence of Confucianism would have been even greater than it was, but for the imperial partiality periodically shown for rival doctrines, such as Buddhism and Taoism, which threw their weight on the side of the supernatural, and which at times were exalted to such great heights as to be officially recognized as State religions. These, Buddhism especially, appealed to the popular imagination and love of the marvellous. Buddhism spoke of the future state and the nature of the gods in no uncertain tones. It showed men how to reach the one and attain to the other. Its founder was virtuous; his commandments pure and life-sustaining. It supplied in great part what Confucianism lacked. And, as in the Page 63fifth and sixth centuries A.D., when Buddhism and Taoism joined forces and a working union existed between them, they practically excluded for the time all the “chilly growth of Confucian classicism.”The Chinese are not unimaginative, but their minds did not go on to the construction of any myths which should be world-great and immortal; and one reason why they did not construct such myths was that their intellectual progress was arrested at a comparatively early stage. It was arrested because there was not that contact and competition with other peoples which demands brain-work of an active kind as the alternative of subjugation, inferiority, or extinction, and because, as we have already seen, the knowledge required of them was mainly the parrot-like repetition of the old instead of the thinking-out of the new1—a state of things rendered possible by the isolation just referred to. Confucius discountenanced discussion about the supernatural, and just as it is probable that the exhortations of Wên Wang, the virtual founder of the Chou dynasty (1121–255 B.C.), against drunkenness, in a time before tea was known to them, helped to make the Chinese the sober people that they are, so it is probable—more than probable—that this attitude of Confucius may have nipped in the bud much that might have developed a vigorous mythology, though for a reason to be stated later it may be doubted if he thereby deprived the world of any beautiful and marvellous results of the Page 62highest flights of poetical creativeness. There are times, such as those of any great political upheaval, when human nature will assert itself and break through its shackles in spite of all artificial or conventional restraints. Considering the enormous influence of Confucianism throughout the latter half of Chinese history—i.e. the last two thousand years—it is surprising that the Chinese dared to think about supernatural matters at all, except in the matter of propitiating their dead ancestors. That they did so is evidence not only of human nature’s inherent tendency to tell stories, but also of the irrepressible strength of feeling which breaks all laws and commandments under great stimulus. On the opposing unæsthetic side this may be compared to the feeling which prompts the unpremeditated assassination of a man who is guilty of great injustice, even though it be certain that in due course he would have met his deserts at the hands of the public executioner.
Delano, Jack,, photographer.
Night view of part of the South Water street freight terminal of the Illinois Central R.R., Chicago, Ill.
1943 May
1 transparency : color.
Notes:
Title from FSA or OWI agency caption.
Transfer from U.S. Office of War Information, 1944.
Subjects:
Illinois Central Railroad
World War, 1939-1945
Railroad stations
Office buildings
Night
United States--Illinois--Chicago
Format: Transparencies--Color
Rights Info: No known restrictions on publication.
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
Part Of: Farm Security Administration - Office of War Information Collection 12002-11 (DLC) 93845501
General information about the FSA/OWI Color Photographs is available at hdl.loc.gov/loc.pnp/pp.fsac
Higher resolution image is available (Persistent URL): hdl.loc.gov/loc.pnp/fsac.1a34788
Call Number: LC-USW36-606
Persistent URL: digital.lib.muohio.edu/u?/tradecards,4730
Subject (TGM): Flowers; Roses; Furniture; Furniture industry; Furniture stores;