[Investigations on the effectiveness of active influenza immunization].
D006801:Humans; D007110:Immunity, Active; D007114:Immunization; D007252:Influenza Vaccines / Q000627:therapeutic use*; D007251:Influenza, Human / Q000517:prevention & control*; D012140:Respiratory Tract Diseases / Q000517:prevention & control*
D007252:Influenza Vaccines
Untersuchungen zur Wirksamkeit der aktiven Influenza-Schutzzimpfung.