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How ‘contagious abortion’ in cows led to one of the first known references to herd immunity

One of the first known references to #HerdImmunity came amid an outbreak of “contagious abortions” (#brucellosis) in livestock in the early 20th century.




Read more at:

https://www.washingtonpost.com/history/2021/05/18/herd-immunity-history-cows/

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