People know when they have Covid symptoms, but do minor sniffles at the end of a coronavirus infection, for example, mean they’re still contagious?
It’s a good time to brush up on what scientists know, and still don’t know, about how long people remain infectious with viral diseases — Covid, influenza, RSV — that are spreading across the U.S.How long am I contagious with Covid?
If you’ve been exposed to someone who has tested positive for Covid, symptoms from any of the omicron subvariants generally appear two to four days later.
How contagious you are is connected to how much of the virus, known as the viral load, is in your body.
As far as relying on Covid tests to determine whether someone is still contagious, PCR tests are good at diagnosing Covid.