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  • The plague disease, caused by Yersinia pestis, is enzootic in populations of ground rodents in Central Asia. Morelli et al. reported the origin of the plague bacillus to be in China. An older theory places the first cases in the steppes of Central Asia, although some speculate that it originated around northern India, and others, such as the historian Michael W. Dols, argue that the historical evidence concerning epidemics in the Mediterranean and specifically the Plague of Justinian point to a probability that the Black Death originated in Africa and spread to Central Asia, where it then became entrenched among the rodent population. Nevertheless, from Central Asia it was carried east and west along the Silk Road, by Mongol armies and traders making use of the opportunities of free passage within the Mongol Empire offered by the Pax Mongolica. It was reportedly first introduced to Europe at the trading city of Caffa in the Crimea in 1347. After a protracted siege, during which the Mongol army under Jani Beg was suffering the disease, they catapulted the infected corpses over the city walls to infect the inhabitants.

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