title: The efficacy of the A2/Aichi/68 strain in inhaled influenza immunisation against the A/England/42/72 variant.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D006801:Humans; D007114:Immunization; D009980:Influenza A virus / Q000276:immunology*; D007252:Influenza Vaccines / Q000008:administration & dosage*; D007251:Influenza, Human / Q000517:prevention & control*; D008297:Male; D008875:Middle Aged; D012621:Seasons; D015164:Vaccines, Inactivated / Q000008:administration & dosage*
chemical_list: D007252:Influenza Vaccines; D015164:Vaccines, Inactivated