Families share germs: After having 2-3 days of cold or flu symptoms, a person is still quite contagious. It is hard to tell when a person is not contagious, because that varies from case to case, and because the viruses decrease over a few days (they don't all die at exactly one moment in time). The safer thing to do is to avoid spreading viruses by touching others, or by sneezing or coughing on others, for a week.
Answered 12/14/2019
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