LogGrad98
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Guns germs and steel is an awesome book. Love it.Natural herd immunity is part of the evolution of every animal.
Europeans had acquired herd immunity to many diseases (smallpox, etc) that they carried to the Americas, where millions of Native Americans, who had no such immunity, were wiped out. See "Guns, Germs and Steel" by Jared Diamond, where it is well explained.
Here are a few others from a quick google search:
Herd immunity is a 20th-century concept, so, of course, most cases throughout history and across all species are unknown and undocumented.
- Great Influenza (Spanish Flu)
- avian cholera in Arctic-nesting seabirds
- measles in humans in the 1930s
- Avian cholera in Arctic-nesting seabirds
- West Nile Virus across various bird species