sweden doesn't have herd immunity
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things like masks are what's required, you need many factors to bring Rt < 1
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You don’t need to get Rt < 1 for herd immunity. Herd Immunity Threshold (HIT) = 1 - 1/Rt; and Masks and social distancing keeps R0 below 1.25. So plugging that in, HIT = 1 - 1/1.25 = 20% HIT equation from here - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7151357/ …
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