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在麻疹减毒活疫苗(简称麻苗)使用之前,人们通过防治实践对麻疹发生和流行的规律性有一定认识。在我省,一年四季都有病例发生,东部农业区每隔2～3年、3～4年于冬春季节出现较大面积的麻疹流行,其流行规模和强度与易感率的高低密切相关;在西部的牧业区及一些偏僻地区,麻疹流行的间隔年限比较长或多年不发生,一旦遇有传染源进入,未得过麻疹的人以至成人都有发病。自从1967年推行麻苗接种以来,麻疹在周期性、季节性以及发病年龄等流行病学特征方面都
Before the live attenuated measles vaccine (referred to as Ma Miao) before the people through the practice of prevention and treatment of measles and epidemic regularity have a certain understanding. In our province, cases occurred all year round. In the eastern agricultural area, a large area of measles epidemic occurred every 2 to 3 years and 3 to 4 years in winter and spring. The epidemic scale, strength and susceptibility were close ; In the western pastoral areas and some remote areas, the interval between the prevalence of measles is rather long or years old. In the event of a source of infection, those who have not had measles have an incidence of disease as well as adults. Since the introduction of measles vaccine in 1967, measles has had epidemiological characteristics such as cyclical, seasonal and age of onset