From the Centers for Disease Control. Update: influenza activity and vaccine availability--United States, 1991 and 1992.
D000293:Adolescent; D000368:Aged; D002648:Child; D004196:Disease Outbreaks / Q000517:prevention & control; D006801:Humans; D009980:Influenza A virus; D007252:Influenza Vaccines / Q000600:supply & distribution*; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D014481:United States / Q000453:epidemiology
D007252:Influenza Vaccines