Something that I think is worth explaining: The term "herd immunity" has a few different meanings, all of which are quite precise. This is an important pointpic.twitter.com/PBnK4J6ntD
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So you're not using a form of Rt that changes with immunity, not with public health interventions and/or behavior changes (ex: mask-wearing, lockdowns, ending visits to nursing homes). Because that's what the contrarians are going to try + pull.
Oh it can change with interventions too as a fraction, but that's not immunity at least in my opinion
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