From the Centers for Disease Control and Prevention. Update: influenza activity--United States and worldwide, June-September, 2002.
D014943:Global Health; D006801:Humans; D009980:Influenza A virus; D009981:Influenza B virus; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D012621:Seasons; D014481:United States / Q000453:epidemiology
D007252:Influenza Vaccines