Immunization action month-October 1973.
D002675:Child, Preschool; D003140:Communicable Disease Control; D003141:Communicable Diseases / Q000453:epidemiology; D004196:Disease Outbreaks; D006801:Humans; D007114:Immunization; D007167:Immunotherapy; D012737:Sex Factors; D014481:United States; D014611:Vaccination