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1969～1981年计13年间,共有203例麻痹型脊髓灰质炎病例上报至亚特兰大疾病控制中心病毒疾病部,其中包括最近分别在1979、1980、1981年发生的22例、9例,7例。在50年代初,脊髓灰质炎患者超过1万例,甚至在应用疫苗的初期,每年患病数仍有几百至几千。1952年发病率高达13.7/10万,1981年已降为为0.03/10万。发病率的下降,除说明病例数目减少外,也可藉以观察该病的流行特征。
A total of 203 cases of paralytic poliomyelitis were reported to the Atlanta Centers for Disease Control and Prevention’s Virus Disease Unit during the 13 years between 1969 and 1981, including 22 cases recently, 9 cases and 7 cases, which occurred in 1979, 1980 and 1981, respectively. In the early 1950s, there were more than 10,000 poliomyelitis patients, and even in the early stages of vaccine application, the number of cases still varied from a few hundred to a few thousand each year. The incidence was as high as 13.7 / 100,000 in 1952 and 0.03 / 100,000 in 1981. The decline in the incidence, in addition to reducing the number of cases, but also to observe the epidemic characteristics of the disease.