鼠疫这一为人类带来巨大灾难的自然疫源性疾病，在自然界的循环十分复杂，多少年来人们进行了不懈的研究探索，取得了可喜成绩。至今已初步揭示其长存、流行的一般规律，也掌握了一定的控制鼠疫流行的措施。世界各国虽然在控制鼠疫的方法上各有不同，但防治水平都在不断提高［ The plague, a natural foci disease that has brought great catastrophe to mankind, has a complicated cycle in nature. People have made unremitting efforts in research and exploration for many years and achieved gratifying results. Up to now, the general laws of its existence and prevalence have been tentatively revealed, and some measures have been taken to control the epidemic of plague. Although the countries in the world have different methods of controlling the plague, the level of prevention and treatment is constantly rising [