Children have been routinely immunized against polio since 1958.
自从1958 

,儿童都按照常规接种防治小儿
症的疫苗。
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故事 One of the men responsible for its creation, physician and researcher Jonas Salk, went on to announce that he'd created a polio vaccine in 1953, a year after a polio epidemic in which 58,000 new diagnoses were reported in the US.
该疫苗
发明人之一、医生兼研究员乔纳斯·索尔克宣布,他在1953年发明了小

症疫苗,此前一年,美国
小

症流行开来,据报道有58000例新诊断病例。