Influenza, HumanInfluenza A virusInfluenza VaccinesInfluenza A Virus, H1N1 SubtypeInfluenza in BirdsInfluenza B virusInfluenza A Virus, H3N2 SubtypeInfluenza A Virus, H5N1 SubtypeHemagglutinin Glycoproteins, Influenza VirusOrthomyxoviridaeOrthomyxoviridae InfectionsInfluenza A Virus, H9N2 SubtypePandemicsInfluenza A Virus, H3N8 SubtypeInfluenza A Virus, H2N2 SubtypeNeuraminidaseInfluenza A Virus, H7N7 SubtypeHemagglutination Inhibition TestsDisease OutbreaksOseltamivirInfluenza A Virus, H5N2 SubtypeHemagglutinins, ViralInfluenza A Virus, H7N9 SubtypeSeasonsPrimary PreventionVaccinationReassortant VirusesAntibodies, ViralBirdsInfluenza A Virus, H1N2 SubtypeAntiviral AgentsVaccines, InactivatedZanamivirAmantadineMadin Darby Canine Kidney CellsPoultryCenters for Disease Control and Prevention (U.S.)DucksDogs