Influenza, HumanInfluenza A virusInfluenza A Virus, H1N1 SubtypeInfluenza VaccinesInfluenza A Virus, H3N2 SubtypeInfluenza in BirdsInfluenza B virusInfluenza A Virus, H5N1 SubtypeHemagglutinin Glycoproteins, Influenza VirusOrthomyxoviridaeOrthomyxoviridae InfectionsRNA VirusesPandemicsInfluenza A Virus, H9N2 SubtypeVirus ReplicationVaccinia virusVirus SheddingNeuraminidaseVirus CultivationInfluenza A Virus, H3N8 SubtypeInfluenza A Virus, H7N7 SubtypeReceptors, VirusHemagglutination Inhibition TestsDisease OutbreaksHemagglutinins, ViralInfluenza A Virus, H7N9 SubtypeInfluenza A Virus, H2N2 SubtypeInfluenza A Virus, H5N2 SubtypeVirus DiseasesAntiviral AgentsOseltamivirAntibodies, ViralVirus AssemblyBirdsRNA, ViralAntigens, ViralSimian virus 40United StatesSeasonsVaccinationDefective VirusesViral ProteinsInfluenza A Virus, H1N2 SubtypePlant VirusesDNA VirusesMeasles virusSindbis VirusRabies virusDucksGenes, ViralReassortant VirusesVaccines, InactivatedNational Institutes of Health (U.S.)Cell LineRespiratory Syncytial VirusesPhylogenyMolecular Sequence DataAmantadineMadin Darby Canine Kidney CellsHepatitis B virusPoultryWest Nile virusDogsNeutralization TestsVesicular stomatitis Indiana virusVirus ActivationPopulation SurveillanceVirionViral Plaque AssayVero CellsCercopithecus aethiopsVaccines, AttenuatedZanamivirInfluenzavirus CInfluenza A Virus, H7N3 SubtypeVirus LatencyVirus AttachmentParainfluenza Virus 1, HumanNational Health ProgramsTime FactorsVirologyPneumonia, ViralViral Core ProteinsNucleoproteinsVirus InactivationChickensCross ProtectionSimian immunodeficiency virusOncogenic VirusesSentinel SurveillanceCross ReactionsMumps virusAmino Acid SequenceRNA ReplicaseVirulenceSemliki forest virusSequence Analysis, DNADNA, ViralRespiratory Syncytial Virus InfectionsChick Embryo