A History of Black Death and its Effects on Western Europe

This plague, thought to be the Bubonic plague, spread throughout Europe, killing about half its population. It was called the Black Death because of the black blotches that appeared on the victims' bodies. This plague was carried by infected fleas of the black rat. Theology, developed in accordance with this idea, threw about all cures, even those which resulted from scientific effort, an atmosphere of supernaturalism. The vividness with which the accounts of miracles in …

…none, or very few, who showed these symptoms, were cured. The symptoms were the following: a bubo in the groin, where the thigh meets the trunk; or a small swelling under the armpit; sudden fever; spitting blood and saliva (and no one who spit blood survived it). It was such a frightful thing that when it got into a house, as was said, no one remained. Frightened people abandoned the house and fled to another."