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New Covid wave has begun and masks should be worn again, scientists warn
(www.independent.co.uk)
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Why are we still talking about Covid? Shouldn't we all have a good deal of immunity against it?
We dont have immunity, that's the point. read the article.
With so much vaccination, how does people don't have immunity yet?
Even if they were not vaccinated for a while, there's always a percentage of immunity. The virus itself is not that deadly as well.
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