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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

this post was submitted on 17 Aug 2023
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