Black Death is so called "the plague",caused by Yersinia pestis,it is a kind of disease of natural foci.it may be used as terrifying biological weapons,casuing terrible effect on humanity peace.Plague is a disease prevalent in wild rodents.Rat as an important source of infection,humans mainly through the medium of rat flea,passed through the skin causing bubonic plague,pneumonic plague occurs through respiratory system.Clinical manifestations：fever,severe toxemia symptoms,swollen lymph nodes,inflammation,bleeding tendency etc.May develop sepsis,contagious,high mortality.It is the most serious crimes against humanity potent infectious diseases,an international quarantine infectious diseases in our country,"Communicable Disease Control Act" as the first infectious diseases
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