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flag Bacteria causing the Black Death evolved to become less deadly but more contagious, study finds.

flag Researchers have found that the Yersinia pestis bacterium, responsible for the Black Death, survived for centuries by evolving to create less deadly and more transmissible strains. flag This evolution involved changes to a single gene, pla, leading to reduced virulence and longer infection periods, which allowed the disease to spread further. flag This discovery could offer insights into managing modern plague outbreaks.

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