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 Covid-19 symptoms, when they occur, vary widely and undertesting means many people have probably been unwittingly infected * Coronavirus - latest updates * See all our coronavirus coverageCovid-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? Is there any way to know whether someone has had Covid-19 in the past?Dr William Hillmann: At this point, we don't have a test to tell that. We are developing antibody tests to check for a prior infection, but those aren't ready for clinical use yet. The only definitive way to know that you've had it is to get tested while you have it and to have that test be positive. Could I have had it and been asymptomatic? Hillmann: Coronavirus is actually quite a significant spectrum of symptoms, from people who are entirely asymptomatic and would have no idea that they have it to people with very mild, cold-like symptoms - runny nose, congestion, sore throat - to people with more flu-like symptoms - high fevers, muscle aches, shortness of breath and cough. All the way up to people with severe illness, who we're seeing in the hospital with respiratory failure, requiring ICU care. (Editor's note: recent reports suggest that loss of smell and taste are also signs of Covid-19 infection.) What percentage of carriers are asymptomatic?Dr David Buchholz: Right now in
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