Normally, enough rats have genetic resistance to Y. When the rat dies, the flea jumps to another rat. pestis passes it on to a black rat by biting it. The black rat flea is also the primary host of the deadly plague bacteria, Yersina pestis (named after Alexandre Yersin who discovered it in 1894).Ī flea infected with Y. Since the last Ice Age, a certain flea has lived off the blood of rodents, especially the black rat, in Central Asia. Later called the “Black Death,” this plague upended feudal society and hastened major changes in Western Civilization. Millions of people in Europe perished in the plague that struck in the mid-1300s. The ‘Black Death’: A Catastrophe in Medieval Europe The “Black Death”: A Catastrophe in Medieval Europe | The Potato Famine and Irish Immigration to America | The Debate Over World Population: Was Malthus Right?
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