I read a lot about herd immunity lately and thought that some of you might be interested, too, in a brief summary.

Correction to what I say at 49 secs. Herd immunity was not first *observed* on sheep, the phrase was first used referring to sheep. See:

https://www.thelancet.com/jour....nals/lancet/article/

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The paper about herd immunity suggesting 40% is this:

https://science.sciencemag.org..../content/369/6505/84

The one with the even lower estimate is this:

https://www.medrxiv.org/conten....t/10.1101/2020.04.27

Please remember that these are models, and these are the very optimistic end. The more conservative estimate is about 60-70%.

The paper about the blood donation study in Manaus is this:

https://www.medrxiv.org/conten....t/10.1101/2020.09.16

You find the Great Barrington Declaration here:

https://gbdeclaration.org/

The pieces from the Guardian I mention are here:

https://www.theguardian.com/co....mmentisfree/2020/oct
https://www.theguardian.com/co....mmentisfree/2020/oct

The one in the Lancet is this:

https://www.thelancet.com/jour....nals/lancet/article/

Sound: zapsplat.com

#science #education #covid

0:00 Intro
0:21 What is herd immunity?
1:28 When do we reach herd immunity? Simple Answer.
3:33 When do we reach herd immunity? Complicated Answer.
5:40 What do the data say?
10:52 Fact Summary.
11:14 The Great Barrington Declaration
13:24 Why am I telling you this?