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Infectiousness

COVID-19 Rapid Antigen Tests Correlate With Short-term Infectiousness

Rapid antigen tests for COVID-19 might yield false negative results when viral loads are low, but in those cases, the virus may not yet be transmissible, a new study suggests. Researchers performed rapid antigen tests on swab samples from 181 individuals with PCR-confirmed SARS-CoV-2 infections and then tried to culture […]

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Pinpointing the Infectiousness of SARS-CoV-2 and Its Alpha (B.1.1.7) Variant

Asymptomatic infected individuals (and those infected with Alpha) had relatively high viral loads; samples from Alpha cases also had higher probability of viral culture positivity. Determining the infectiousness of individuals with COVID-19 requires considering degree of symptoms, time point within disease course, and whether the infection involves wild-type SARS-CoV-2 or […]

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