Finally, it was determined that fleas on rats caused the Black Death, but that wasn’t until the 1890s.
How did rats and fleas cause the Black demise?
Black rats have been the most common at the moment and carried the micro organism known as Yersinia pestis, which caused the plague. The rats then unfold it to fleas that lived on their bodies. The fleas would drink the blood of infected rats, swallowing dangerous microorganisms. They then passed the infection onto people by means of biting them.
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