Extremely virulent organism that causes plague. Yersinia pestis biovar Microtus str. 91001

Yersinia pestis biovar Microtus str. 91001. Formerly the Medievalis subtype (biovar) that is widely used in research and is well characterized. The biovar has been renamed to Microtus.

鼠疫耶尔森菌（Yersinia pestis）田鼠生物型（biovar Microtus）菌株91001。该菌株此前曾被归类为中世纪生物型（Medievalis）亚型，被广泛应用于科研工作且已得到充分表征。该生物型现已更名为田鼠生物型（Microtus）。