Some people with COVID-19 remain infectious well into the second week after they first get symptoms.
Credit: Agustin Marcarian/Reuters/Alamy
“The facts of how long people are infectious for have not really changed,” says Amy Barczak, an infectious-disease specialist at Massachusetts General Hospital in Boston. “There is not data to support five days or anything shorter than ten days [of isolation].
“There’s still all of these things that we’re not exactly sure about, but if I had to sum it up in one very concise message, it would be that if you’re antigen positive, you shouldn't go out and interact closely with people who you don’t want to be infected,” says Emily Bruce, a microbiologist and molecular geneticist at the University of Vermont in Burlington.
It’s not practical to track direct onward transmission of the virus from large numbers of people and to measure how it reduces over time, so researchers instead rely on proxy measurements to determine the point at which they would expect people to stop being contagious.
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