"it's possible the virus can become more deadly, but there isn't an evolutionary reason for that to happen" Virus isn't mutating by choice. If mutation is necessary to survive, that will be passed on as it spreads. If the mutation has side effect of being more deadly, it will be.
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Delta is already highly transmissable. By the time the host dies it will have already replicated fully and spread. There's no evolutionary reason it can't become more deadly and still spread fast.
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I guess they'll just keep administering new booster shots til everyone has three arms instead of two . smh
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