The Centers for Disease Control and Prevention on Tuesday clarified its guidance for people who want to use tests when they’re done isolating at home with COVID
that people are much more likely to be contagious just before symptoms pop up and for just about two to three days afterward.
“After that, the concentration of virus begins to fall off very, very rapidly. When the concentration of live virus falls off, you become much less infectious to others,” he said. Rapid antigen tests are less sensitive overall and more useful to help diagnose cases of COVID-19 when people first have symptoms, experts said.
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