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索克疫苗问世至今已二十五年了。在这段时间里,美国几乎没有发生过麻痹型脊髓灰质炎。本世纪五十年代中期以后参加工作的医生,大多数都没有见过一例真正的脊髓灰质炎病人。
Soek vaccine has been around for 25 years. Almost no paralytic poliomyelitis has occurred in the United States during this period. Most of the doctors who took part in the work after the mid-1950s have not seen a real patient with poliomyelitis.