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Politics : Politics for Pros- moderated

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i-node

lightshipsailor

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To: i-node who wrote (703421)	2/9/2020 10:36:52 PM
From: Stan	3 Recommendations of 793928

I thought this was quite informative ala the math: Determining the R0 of a particular microbe is a matter of more than academic interest. If you know how many secondary cases to expect from each infected person, you can figure out the level of herd immunity needed in the population to keep the microbe from spreading. This is calculated by taking the reciprocal of R0 and subtracting it from 1. For measles, with an R0 of 12 to 18, you need somewhere between 92 percent (1 – 1/12) and 95 percent (1 – 1/18) of the population to have effective immunity to keep the virus from spreading. For flu, it’s much lower — only around 50 percent. And yet we rarely attain even that level of immunity with vaccination.

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