Effectiveness of current killed influenza vaccines against influenza A-England-42-72.
D000368:Aged; D000906:Antibodies / Q000032:analysis; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000517:prevention & control*; D014611:Vaccination
D000906:Antibodies; D007252:Influenza Vaccines