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CADILLAC — When the polio vaccine was introduced in the 1950s, children were the first group in society to be immunized, since they were most at risk if they developed

United statesJennifer morseJames whelanLisa loweryAmerican academy of pediatricsCentral michigan district health departmentDistrict health department noChildren hospital associationSpectrum health medical groupAmerican academyHospital associationDistrict health departmentCentral michigan district healthClinical infectious diseasesHelen devos childrenHospital spectrum health medical group