Influenza, HumanInfluenza B virusInfluenza A virusInfluenza A Virus, H1N1 SubtypeInfluenza VaccinesInfluenza A Virus, H3N2 SubtypeAntiviral AgentsInfluenza in BirdsSeasonsInfluenza A Virus, H5N1 SubtypePopulation SurveillanceOrthomyxoviridaeHemagglutinin Glycoproteins, Influenza VirusPandemicsDisease OutbreaksOrthomyxoviridae InfectionsOutpatientsDrug Resistance, ViralUnited StatesSentinel SurveillanceVirus ReplicationWorld HealthInfluenza A Virus, H9N2 SubtypeHospitalizationOseltamivirNeuraminidaseInfluenza A Virus, H3N8 SubtypeVaccinationPneumoniaInfluenza A Virus, H7N7 SubtypeHemagglutination Inhibition TestsInfluenza A Virus, H2N2 SubtypeAntigens, ViralAmantadineHemagglutinins, ViralRimantadineInfluenza A Virus, H5N2 SubtypeInfluenza A Virus, H7N9 SubtypeZanamivirVirus DiseasesAntibodies, ViralRNA, ViralCell LineRNA VirusesVaccinia virusCell DeathVirus SheddingViral ProteinsBirdsVirus CultivationViral Plaque AssayInfluenza A Virus, H1N2 SubtypeReceptors, VirusReassortant VirusesCause of DeathTime FactorsInfant, NewbornDisease NotificationMolecular Sequence DataVaccines, InactivatedAcyclovirIncidenceDucksOrganophosphonatesVero CellsDogsMadin Darby Canine Kidney CellsVirus AssemblyCercopithecus aethiopsEuropePoultryHepatitis B virusPyransPhylogenyRNA ReplicaseInfluenzavirus CAmino Acid SequencePneumonia, ViralHepacivirusDefective VirusesInterferonsGenes, ViralInfluenza A Virus, H7N3 SubtypeVaccines, AttenuatedSimian virus 40DNA VirusesVesicular stomatitis Indiana virusViral Matrix ProteinsRibavirinCells, CulturedViral Nonstructural ProteinsSindbis VirusCross ProtectionDNA, ViralPlant VirusesRespiratory Syncytial VirusesNeutralization TestsVirus ActivationNucleoproteinsMice, Inbred BALB C