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« (1/12) Here's a THREAD👇 about how smallpox - one of the deadliest & most contagious disease known to man - was used as a biological weapon during the American Revolution in one of the earliest documented examples of germ warfare. Photo: @ExploreWellcome t.co/PPjpqqpYUS »

— Retweet twitter.com/DrLindseyFitz/stat

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