Colds, flus, and COVID-19 are contagious from the time you get them (even before you have symptoms) up to ten days after your symptoms start. They’re usually not contagious after ten days, even if you’re still coughing or congested.
The best way to avoid passing on a URI (or catching one in the first place) is to wash your hands frequently, cover your mouth with your arm when you cough or sneeze and wear a mask that fully covers your mouth and nose. It’s also best to take at least a couple of days off work or school while you’re most contagious.
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