The difference between 20% immunised and 50% may not be enough to completely prevent outbreaks, but it still substantially reduces the size of them if they do happen
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There is no threshold for Herd Immunity without a clear definition of what incidence of the disease is going to be tolerated to declare “herd immunity”. Even with HI, measles occurs in USA. Question is the acceptable rate in which case HI simply means “good enough”
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Exactly, unfortunately a lot of people don't get it, and politicians are happy for the confusion to be nurtured for their own political purposes.
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100% correct
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Correct. But I'd further add that policy stringency should also be aligned with this move along the immunity spectrum. When they're saying we must hit 80% and no time sooner to stop or be less strict in doing what they're doing now, it feels ignored.
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We can currently see in UK that a nearly 90% sero positive population (infection+vaccination) is not enough to stop the spread.
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How did you compute the 90%?
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