The Black Death is the 19th-century CE term for the plague epidemic that ravaged Europe between 1347-1352 CE, killing an estimated 30 million people there and many more worldwide as it reached pandemic proportions. The name comes from the black buboes (infected lymph glands) which broke out over a plague victim's body. The cause of the plague was the bacterium Yersinia pestis, which was carried by fleas on rodents, usually rats, but this was not known to the people of the medieval period, as it was only identified in 1894 CE. Prior to that time, the plague was attributed primarily to supernatural causes – the wrath of God, the work of the devil, the alignment of the planets – and, stemming from these, “bad air” or an unbalance of the “humors” of the body which, when in line, kept a person healthy.

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Original Article: https://www.worldhistory.org/article/1540/medieval-cures-for-the-black-death/