COVID-19: when are you most infectious?


A close friend – let’s call him John – recently called, asking for advice. He woke up with severe muscle aches and fatigue. Understandably worried that it could be COVID-19, he asked whether he should go to work, run to get a test or stay home. Because he didn’t have other symptoms, such as a fever, cough or shortness of breath, he was unsure what to do. Of course, this could be any other respiratory infection, such as the flu or the common cold, but what if it is COVID-19? What is the risk of him transmitting the virus to others?

To understand when people with COVID-19 are most likely to be infectious, our team conducted a study which was recently published in The Lancet Microbe.




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