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COVID-19 culture suggests some people may still be contagious after 5 days

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COVID-19 の培養検査では、一部の人は 5 日後も感染力を維持している可能性があることが示唆されていますJAMA Network Open (2022). DOI: 10.1001/jamanetworkopen.2022.25331″ width=”800″ height=”530″/>

Rapid antigen test (RAT) and viral culture results A, 10 days later (days 12, 13, and 14), were negative in 3 individuals, but test data were missing on the previous day or days. These individuals were negatively censored at the earliest possible negative day (day 11 for 2 and day 12 for 1). B, A total of 161 his RATs were performed with 40 participants from day 6; Of these, 90 tests were performed on individuals who reported no symptoms on the day of RAT, with 61 positive and 29 negative results (predictive negative). value, 32%). C, viral culture results were obtained from 17 individuals. Lines connect the numbers of each of the 17 symptoms on days 0 and 6. credit: JAMA network open (2022). DOI: 10.1001/jamanetworkopen.2022.25331

A team of researchers from Brigham and Women’s Hospital, the National Emerging Infectious Diseases Laboratories, the Massachusetts Institute of Technology (MIT) and the Broad Institute at Harvard University found that it is possible to infect others more than five days after initial infection. Some people report that there are.In their paper published in JAMA network openresearchers are testing infected patients using both rapid antigen testing (RAT) and viral cultures to learn more about how long infected people can transmit the SARS-CoV-2 virus to others. It explains how it was tested.

Current guidelines provided by the U.S. Centers for Disease Control recommend that people infected with COVID-19 be quarantined for five days after initial infection to prevent the spread of the disease. In this new effort, researchers have found evidence that suggests such days may not be enough, at least for some people.

To learn more about how long people remain contagious after being infected with COVID-19, researchers are looking for people who are known to be infected and who are at risk of severe symptoms. asked for help from 40 people in the Boston area who weren’t expected. All volunteers had been vaccinated and received booster shots. Also, at the time of the study, Omicron BA.1 was the predominant strain. All volunteers were asked to complete a daily symptom log and from his sixth day of infection he self-tested for COVID-19 using the Flowflex lateral flow RAT test daily. Each volunteer also submitted culture swabs for antigen testing daily beginning on her sixth day.

Researchers found that 75% of volunteers were antigen-positive on day 6, and many reported no symptoms. They also found a culturable viral load in his 35% of those who tested positive for antigen. All volunteers who tested positive for the RAT also tested positive for culture. And of the six volunteers who tested positive for culture on day six, four were released from isolation under current CDC guidelines.

Although the researchers had few participants in their study, their findings suggest that at least some people may remain infected for more than five days after initial infection. I admit that I am strong enough to show.


Researchers examine duration of infection in individuals vaccinated with SARS-CoV-2, Omicron, and delta variants


For more information:
Lisa A. Cosimi et al, Association between duration of symptoms after SARS-CoV-2 infection and positive home rapid antigen test results, JAMA network open (2022). DOI: 10.1001/jamanetworkopen.2022.25331

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Quote: A COVID-19 culture test suggests that after 5 days (August 4, 2022) some people may remain infectious. html

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