Naturally occurring plague occurs most frequently in bubonic or septicemic forms and is usually acquired through the bite of an infected rodent flea.

• 摘要鼠疫是一种自然疫源性疾病，主要在野生啮齿动物间流行，经蚤类叮咬可感染造成人间腺型、败血症型鼠疫。