Mutations in viruses -including COVID-19 - are not new nor were they unexpected. All RNA viruses mutate over time, some more than others. We are all familiar with the how flu viruses change often, which is why you get a new flu vaccine every year. When viruses mutate, generally, they either kill the virus (a type of “virus-suicide”) or they can have no effect whatsoever on the normal behavior of the virus.
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