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Why do people without underlying health conditions get seriously ill from covid-19?

Answer: 

New Scientist answers, "Some people get seriously ill from covid-19 without any known risk factors. Genetic make-up is likely to play a role – we have long known that having a parent who died young from an infectious disease puts you at a sixfold greater risk of doing so yourself. The genes that make a difference are probably involved in the immune system."

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