Coronavirus hits the old and those with other health problems hardest, but fit, youthful people are dying too, and experts are trying to understand why
It remains one of the biggest puzzles of the Covid-19 pandemic. The disease generally causes serious problems only in older people or those with underlying health problems. But occasionally it strikes down young, apparently fit individuals, including medical staff exposed to patients with the virus.
In some cases, previously undiagnosed conditions are later revealed but in others no such explanations are available, leaving scientists struggling to find reasons for the behaviour of the coronavirus.
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