Influenza vaccine, 1990-1991.
D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007115:Immunization Schedule; D007223:Infant; D007252:Influenza Vaccines / Q000008:administration & dosage; D015164:Vaccines, Inactivated
D007252:Influenza Vaccines; D015164:Vaccines, Inactivated