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近年来 ,由于麻疹活疫苗的使用 ,改变了麻疹的流行规律及临床特征。我国从 1 965年普遍接种麻苗后 ,发病率明显下降 ,消灭了流行高峰 ,阻断了几年 1次周期大流行的规律 ,使麻疹的发病率、病死率明显下降。近几年临床观察 ,可能由于接种麻疹疫苗后产生免疫力不持久 ,抗体消失 ,?
In recent years, the prevalence and clinical characteristics of measles have changed as a result of the use of live measles vaccine. After the general vaccination of Jatropha in 1965 in our country, the incidence rate dropped markedly, eliminated the epidemic peak and blocked the regularity of a cyclical epidemic in a few years. As a result, the incidence and death rate of measles dropped significantly. In recent years, clinical observation may be due to immunization after vaccination caused by measles vaccine is not lasting, antibodies disappear?