Have I already had coronavirus? How would I know and what should I do?

Covid-19 symptoms, when they occur, vary widely and undertesting means many people have probably been unwittingly infected

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Covid-19 symptoms vary widely, and undertesting in many countries means that many people may have already had the coronavirus without having received a positive diagnosis. Is it possible to find out, and how should you behave if you think you may have been infected?

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