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And discovered that the book distinctly referenced that herd immunity fails when less than 5% of the population is immune.

With how twisted things are these days, they have rebranded it to mean that it only works only when everyone undergoes experimental gene therapy.

EDIT: I found the source. The ISBN is 0321967674, 9780321967671, Campbell Essential Biology with Physiology, Author(s): Eric J. Simon, Jean L. Dickey, Jane B. Reece, Kelly A. Hogan

is a screenshot of my source.

EDIT 2: Apparently I wrote my notes wrong, the book mentions it fails when 5% are unvaccinated, not when less than 5% are immune. It also says according to the CDC, and given their questionable behavior as of late, take that for what you will.

And discovered that the book distinctly referenced that herd immunity fails when less than 5% of the population is immune. With how twisted things are these days, they have rebranded it to mean that it only works only when everyone undergoes experimental gene therapy. EDIT: I found the source. The ISBN is 0321967674, 9780321967671, Campbell Essential Biology with Physiology, Author(s): Eric J. Simon, Jean L. Dickey, Jane B. Reece, Kelly A. Hogan [Here](https://pic8.co/sh/qJH1zO.png) is a screenshot of my source. EDIT 2: Apparently I wrote my notes wrong, the book mentions it fails when 5% are unvaccinated, not when less than 5% are immune. It also says according to the CDC, and given their questionable behavior as of late, take that for what you will.

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[–] • 1 pt

I 'member herd immunity was 60% and they are now trying to redefine it to 90%

[–] • 1 pt

It depends on the disease. Basically, you calculate the threshold: (R-1)/R, where R is the number of people that a typical person would infect if no one was immune.

Example1: Someone with measles would infect 10 people. If 8 of those people are immune then he infects 2, and those 2 infect 2 each, meaning 4. The disease gets out of control. If 9 out of 10 are immune, then each person only infects 1 person, who then infects 1 person, etc... meaning that it stays steady.

Example 2: Someone with Ebola would infect 2 people. If 3 out of 4 people are immune, then there is only a 50% chance that he infects 1 person, and that person only has a 50% of passing it on, and so the disease quickly dies out.

[–] • 1 pt

So it's math based on assumptions that may not even be correct.

[–] • 0 pt

You're making me want to do math (R-1)/R * Q. Q=chance of infection.

Example 1, R=10 infected, 8 immune. Q = 20% chance of infection (10-1)/10 = 9/10 * 20% = I'm just going to go to sleep now. I don't need math