Possibly, the beginning of the biological warfare. (see Wikipedia.org)

Origins of the disease Main article: Black Death migration The plague disease, caused by Yersinia pestis, is enzootic (commonly present) in populations of fleas carried by ground rodents, including marmots, in various areas, including Central Asia, Kurdistan, Western Asia, North India, and Uganda.[10] Due to climate change in Asia, rodents began to flee the dried-out grasslands to more populated areas, spreading the disease.[11] Nestorian graves dating to 1338–1339 near Issyk-Kul…

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