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In,JonasSalkdevelopedanddebutedtheinactivatedpoliovaccine.Withinfiveyears,casesofpoliointheUnitedStatesdroppeddrastically,andchildhoodvaccinationsforinfectiousdiseaseslikepoliobecameanewstandardofcare.

年，乔纳斯·索尔克研制并首次推出了脊髓灰质炎灭活疫苗。在五年内，美国小儿麻痹症病例急剧下降，儿童脊髓灰质炎等传染病疫苗接种成为新的护理标准。

TheSalkvaccineheraldedanewdawnfortreatinginfectiousdiseasesduringthes,specificallysevererespiratorysyncytialvirus(RSV)infectionsinchildren.However,whenaformalin-inactivatedversionofanRSVvirusvaccinesimilartothepoliovaccinewastrialedin,manyimmunizedinfantsactuallyexperiencedanenhancedformofRSVdisease—