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北京市1985～1995年开展家鼠鼠情监测。结果：有褐家鼠、小家鼠两种，前者为农村优势种，后者为城镇优势种。每年有两个数量高峰（2～4月、9～11月）；自1986年以来开展大规模灭鼠活动，并未改变此规律，但使家鼠密度显著下降。近几年斑疹伤寒发病率大大降低。
Beijing from 1985 to 1995 to carry out domestic mouse and rat monitoring. Results: There are two kinds of Rattus norvegicus, Mus musculus, the former is the dominant species in rural areas, the latter is the dominant species in town. There are two peaks each year (February-April, September-November); large scale rodent extermination activities since 1986 have not changed the law, but the density of domestic rats has dropped significantly. In recent years, the incidence of typhus greatly reduced.