根据产鼠疫菌素的性能可以说明分布于苏联境内的所有自然疫源地的鼠疫菌的特征。凡是在旱獭、黄鼠和砂土鼠为鼠疫动物病流行的主要肇事者的疫源地中,黄鼠变种和旱獭变种的绝大多数菌株都能够产生对伪结核菌1血清型有杀菌活性的物质,这种物质叫做鼠疫菌素Ⅰ(PI)。在外高加索高山疫源地内,鼠疫菌的鼠 The properties of plague-producing bacteria can be used to characterize Yersinia pestis in all natural foci located in the territory of the Soviet Union. In the foci of the main perpetrators of marmot, chinchilla and gerbil, which are the major causes of plague animal disease, most strains of the chrysanthemum variant and the marmot mutant are capable of producing bactericidal activity against the pseudotyped M. tuberculosis serotype 1 Substance, this substance is called plague mycotoxin Ⅰ (PI). In the Caucasus high mountain foci, Y. pestis mice