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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I don't grasp that explanation. I want to, but I don't. Not yet, anyway. I'll read up and get to a point where it makes sense. Thank you for the time and answers!!
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Pretty simple really - we observe an R0 of 2.5 i.e. each person passes the disease on to 2.5 on avg. However, we find out that 50% of people are already immune - that means that the true R0 is actually (x)*0.5 = 2.5 Multiply out, you get R0=5
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