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We've all got that friend, the only one who never tested positive when everyone else did. Despite it feeling like a rare event, there are still hundreds of millions of you out there yet to test positive. So what's behind this? And how come some people, despite being exposed, often multiple times, have never had a positive test? From the guardian, madeline finley, and this is science weekly.

Although several countries around the world continue to have high rates of Covid-19 infections, including the UK and US, many of their citizens are yet to be infected with the Sars-Cov-2 virus. This includes countless individuals who have knowingly been exposed, often multiple times, but have still never had a positive test. Madeleine Finlay speaks to Linda Geddes about how scientists are trying to solve the mystery of why some people seemingly don’t catch Covid, and what could be behind this phenomenon. Help support our independent journalism at theguardian.com/sciencepod