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1969～1981年,美国共报告203例麻痹型灰髓炎病例,其中40例(20%)属于流行性;41例(20%)为与疫苗无关的地方性患者;86例(42%)为与疫苗有关的地方性患者;22例(11%)是传入的;14例(7%)为免疫缺损患者。
From 1969 to 1981, a total of 203 cases of paralytic type myelitis were reported in the United States, of which 40 (20%) were epidemic; 41 (20%) were endemic with no vaccine; 86 (42%) were Of the vaccine-associated endemic patients, 22 (11%) were introduced and 14 (7%) were immunocompromised patients.