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Re:Past Time to Tell the Public:It Will Probably Go Pandemic... by tomohawk on Sunday February 23, 2020 @01:34PM (#22398583)
The 1918 flu particularly affected 20-40 year old healthy people.

https://www.smithsonianmag.com/history/why-did-1918-flu-kill...

Re:Past Time to Tell the Public:It Will Probably Go Pandemic... by jacquesm on Sunday February 23, 2020 @01:41PM (#22398636)
That was an anomaly in many other ways too. Keep in mind that a good chunk of the world was still recovering from WWI. Being exposed to some other disease earlier in life can give a similar effect to vaccination.

This is one of the reasons why HIV spread was not as bad as it could have been in Western Europe where exposure to a disease still gave some benefits many centuries later:

https://www.nature.com/news/2005/050307/full/news050307-15.h...