It's not that they mutate specifically to less dangerous versions; rather the subtle variations that don't kill their host before spreading persist while the ones that are rapidly fatal quickly disappear when containment measures are put in place.
Which makes this one bad as it's infectious for a long time before there are symptoms or it kills the host - hence the panic.
Which makes this one bad as it's infectious for a long time before there are symptoms or it kills the host - hence the panic.
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