H1N1 Flu.
Centers for Disease Control and Prevention, U.S. Department of Health & Human Services.
Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30333, USA. cdcinfo@cdc.gov
D004196:Disease Outbreaks; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000175:diagnosis / Q000453:epidemiology* / Q000517:prevention & control; D014481:United States / Q000453:epidemiology
D007252:Influenza Vaccines