How does covid keep changing into new variants?

Now there's a sub variant, I was looking forward to the summer.

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BizSuitStacy · M

Viruses mutate. Vaccinologists claim that even mass vaccination can create escape variants.

cherokeepatti · 61-69, F

@BizSuitStacy they mutate better when you get vaccinated for one. I would get paraflu with every flu shot….combo of a cold virus and flu virus but much larger than a flu virus. Would make me sick and fatigued all winter long.