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But that seems not to be succesful to protect the weak and vulnerable. The biggest problem with "herd immunity" strategy is that it is only hypothesis. Lack of evidence.
It is naive and dangerous to think of herd immunity as a "strategy". Herd immunity is a scientific fact. The key is to minimize deaths until we get there, and that is done through age specific counter measures, to protect the weak and vulnerable.
That is only exists in "nature".
Herd immunity to covid-19 requires 60% of people infected and 15% of fatality late in elderly people. Three years. That costs more than locking down.
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