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To: i-node who wrote (703421)	2/9/2020 10:23:11 PM
From: skinowski	2 Recommendations Recommended By i-node lightshipsailor Read Replies (1) \| Respond to of 793914

Great article, thanks. I noticed, they say that the case fatality ratio of the Spanish flu was 2.5%. I thought it was higher. A quick check with Wiki shows that: The global mortality rate from the 1918–1919 pandemic is not known, but an estimated 10% to 20% of those who were infected died ( case-fatality ratio). However, in the same article, that say that: In the U.S., about 28% of the population of 105 million became infected, and 500,000 to 675,000 died (0.48 to 0.64 percent of the population). [54] en.m.wikipedia.org Which is actually closer to 2%. It seems, the US fatality rate was a lot lower than in the rest of the world. Interesting. Will check into it. Anyway... I’m glad that the coronavirus pandemic seems likely to have a much lower fatality rate, more like 0.2%.

To: i-node who wrote (703421)	2/9/2020 10:36:52 PM
From: Stan	3 Recommendations Recommended By i-node lightshipsailor Stock Puppy Respond to of 793914

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.