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New Covid wave has begun and masks should be worn again, scientists warn
(www.independent.co.uk)
this post was submitted on 17 Aug 2023
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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