【单选题】【消耗次数：1】
关于脊髓灰质炎，以下描述错误的是
①
人群对脊灰病毒普遍易感，其中5岁以下儿童风险最大
②
人群对脊灰病毒普遍易感，其中80岁以上老年人风险最大
③
脊髓灰质炎曾是导致儿童终生残疾的主要原因
④
在瘫痪病例中，5%-10%的患者因呼吸肌麻痹而死亡
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