title: A Hong Kong influenza immunity three years after immunization.
mesh_terms: D000041:Absenteeism; D000914:Antibodies, Viral / Q000032:analysis; D002648:Child; D004196:Disease Outbreaks; D005500:Follow-Up Studies; D006801:Humans; D007109:Immunity; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000627:therapeutic use; D007251:Influenza, Human / Q000276:immunology* / Q000517:prevention & control; D007279:Injections, Subcutaneous; D012572:School Health Services; D013997:Time Factors; D014861:Washington
chemical_list: D000914:Antibodies, Viral; D007252:Influenza Vaccines