The strain isolated from human case is different from those strains isolated from Microtus fuscus, and similar to the Qingzang plateau strain with strong virulence.

• 从鼠疫病人分离到的菌株与青海田鼠体分离的菌株明显不同,而与强毒的青藏高原型菌株相似;青海田鼠体分离的菌株与内蒙古布氏田鼠型菌株相似,与其他地区的菌株均不相同。