When two brothers fell critically ill with Covid-19 around the same time in March, their doctors were baffled. Both were young—29 and 31 years old— and healthy. Yet within days they couldn’t breathe on their own and, tragically, one of them died. Two weeks later, when a second pair of Covid-stricken brothers, both in their 20s, also appeared in the Netherlands, geneticists were called in to investigate. What they uncovered was a path leading from severe cases, genetic variations, and gender differences to a loss of immune function that may ultimately yield a new approach to treating thousands of coronavirus…
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