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Scientists begin to unravel why some react severely, mildly to coronavirus

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LOS ANGELES - One of COVID-19's scariest mysteries is why some people are mildly ill or have no symptoms and others rapidly die — and scientists are starting to unravel why.An international team of researchers found that in some people with severe COVID-19, the body goes rogue and attacks one of its own key immune defenses instead of fighting the coronavirus.

Most were men, helping to explain why the virus is hitting men harder than women.And separate research suggests that children fare better than adults thanks to robust “first responder” immune cells that wane with age.They're the latest in a list of studies uncovering multiple features of the immune system's intricate cascade that can tip the scales between a good or bad outcome.

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