Letter: Recommendation for DTP.
D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007114:Immunization; D007223:Infant; D009518:New York; D010567:Pertussis Vaccine / Q000008:administration & dosage*; D013997:Time Factors
D010567:Pertussis Vaccine