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Aug 13, 2020 at 12:16 vote accept cal
Aug 12, 2020 at 18:33 comment added StephenS Great answer! It should be noted that mutation speed varies widely; the flu family is notorious for it, whereas others don’t and are thus may only need one vaccination (or past infection) to protect for life.
Aug 12, 2020 at 17:26 history answered Tyler N CC BY-SA 4.0