The CDC now defines a “close contact” of someone with COVID-19 as anyone who was within six feet of someone infected for a total of 15 minutes over the course of 24 hours. For example, if a student came into contact with a sick classmate three times during a school day, for five minutes each time, he would be asked to stay home and isolate himself for 14 days, while checking for fever, coughing, and other symptoms of COVID-19.
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Source: Education Week, October 22, 2020 (Subscription may be required.)