This is the best write up of the whole T cells and herd immunity thing that I've seen, and somehow it still misses a central point: If COVID-19 was this bad WITH EXISTING IMMUNITY then the immunity doesn't matter all that muchhttps://twitter.com/EricTopol/status/1292650588543434752 …
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The herd immunity threshold is a very simple calculation = 1-1/R0 So, with R0=5, we get HIT = 1-1/5 = 80%, which means minimum of 30% further need to be infected to get immunity
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But on top of this, we have the fact that 2.5 is a static figure and the observed R0 is really modelled somewhere between 2.2-4, which means that the HIT could be 25-45% in this scenario
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