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> COVID cases are not correlated with vaccination rate. But everyone knows that the vaccine doesn't stop you from getting infected;

I don't think that's what everyone does, or should know.

In the strict technical use of the word "stop" you are correct. it is not 100% eliminated.

But this is misleading, as the risk of being infected is much reduced by vaccination, as well as the "hospitalization and case severity".

As others have noted, the behaviours of people also influences the infection rate. Lockdown without any vaccination, or no lockdown and high vaccination percentages might give similar infection rates.



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