Immunization of children at high risk from influenza infection.
D002648:Child; D002675:Child, Preschool; D006801:Humans; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000009:adverse effects; D007251:Influenza, Human / Q000517:prevention & control*; D012306:Risk; D014611:Vaccination
D007252:Influenza Vaccines