Tag: Black Death

Illustration of the Black Death from the Toggenburg Bible (1411)
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Single Genetic change created the medieval plague, researchers find

Yersinia pestis, the bacteria that caused Justinian’s Plague and the Black Death, was once only able to cause a mild gastrointestinal infection. However, researchers have found that a single genetic change to bacteria turned into one of the deadliest diseases in human history.

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