Nasopharyngeal swab samples were collected on the first ... Recurrence of Covid-19 was defined according to prespecified criteria for viral load rebound: a half-log increase in viral load on ...

They might use blood, nasal swabs, or other bodily fluids to test the load for a particular virus. People infected with the coronavirus that causes COVID-19 may have different viral loads.

Viral load in these samples did, however, predict their risk of having a SARS-CoV-2 PCR-positive hand swab, which in turn was associated with transmission to their respective contacts. The results ...

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When a person is exposed to Covid, does quantity matter? The conventional wisdom has long been that French-kissing a highly contagious person in a bar will lead to a much worse case than inhaling ...