this post was submitted on 17 Aug 2023
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[–] FoxAndKitten@lemmy.world 2 points 1 year ago

Because immunity varies by disease.

Chicken pox? Pretty much one and done. COVID? Falls off rapidly after 3 months, whether you catch it or get the vaccine

Plus, every mutation is a dice roll on how much existing immunity will apply. It could be exactly the same as the last strain, or the old immunity might not help at all