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百日咳是呼吸道急性传染病，经空气传播而造成流行，严重地危害儿童的身体健康，其发病率1985年为13．08／10万，1995年为0．52／10万．自实行计划免疫后，该病的发病率已明显下降，从而保护了广大儿童的身体健康，现将1985～1995年百日咳513例发病情况分析如下：一、对象和方?
Pertussis is an acute respiratory infectious disease spread through the air and causes epidemics that seriously endanger the health of children. The prevalence rate was 13.08 per 100,000 in 1985 and 0.52 per 100,000 in 1995. Since the implementation of planned immunization, the incidence of the disease has dropped significantly, thus protecting the general health of children, now 1985 ~ 1995 Pertussis 513 cases of onset as follows: First, the object and party?