Selection of influenza strains for 1997 vaccine.
Marwick
C
C
D006801:Humans; D009980:Influenza A virus; D009981:Influenza B virus; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000517:prevention & control*; D012621:Seasons; D014481:United States
D007252:Influenza Vaccines