In the Middle Ages, devil-fearing Christians killed cats, which carried the unintended consequence of increasing the rat population and the spread of the Black Death

The Black Death, one of the most devastating pandemics in human history, spread across Europe between 1346 and The Black Death, one of the most devastating pandemics in human history, spread across Europe between 1346 and 1353. It is widely believed that the plague was caused by the bacterium Yersinia pestis.

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