PandemicsInfluenza A Virus, H1N1 SubtypeInfluenza, HumanDisease OutbreaksRNA VirusesInfluenza A Virus, H5N1 SubtypeInfluenza VaccinesVaccinia virusInfluenza A Virus, H3N2 SubtypeVirus SheddingOrthomyxoviridae InfectionsReceptors, VirusVirus ReplicationVirus CultivationHemagglutinin Glycoproteins, Influenza VirusVirus DiseasesSimian virus 40OseltamivirAntiviral AgentsVirus AssemblyPlant VirusesDNA VirusesDefective VirusesSindbis VirusMeasles virusRabies virusNeuraminidaseRNA, ViralFerretsOrthomyxoviridaeViral ProteinsHepatitis B virusWest Nile virusAntigens, ViralRespiratory Syncytial VirusesHemagglutination Inhibition TestsPhylogenyBirdsQuarantineGenes, ViralSeasonsDisaster PlanningAntibodies, ViralVirus ActivationVesicular stomatitis Indiana virusMolecular Sequence DataVirus LatencyNeutralization TestsReassortant VirusesVero CellsSimian immunodeficiency virusInfluenza in BirdsOncogenic VirusesCercopithecus aethiopsVirionCell LineVirus AttachmentCross ProtectionVaccinationMumps virusHistory, 20th CenturyInfluenza A Virus, H1N2 SubtypeParainfluenza Virus 1, HumanMosaic VirusesInfluenza A Virus, H2N2 SubtypeViral Plaque AssaySemliki forest virusHepatitis A virusVirulenceHydrogen-Ion ConcentrationInfluenza A virusAvian Sarcoma VirusesSequence Analysis, DNAHemagglutinins, ViralBK VirusTumor Virus InfectionsVirologyViruses, UnclassifiedDNA, ViralJC VirusVirus InactivationAvian leukosis virusBasic Reproduction NumberGene Expression Regulation, ViralBluetongue virusSwineAmino Acid SequenceCross ReactionsAntibodies, NeutralizingMoloney murine leukemia virusSendai virusPolymerase Chain ReactionHIV InfectionsVirus IntegrationCapsidTime FactorsDrug Resistance, ViralInfluenza A Virus, H7N9 SubtypeSimplexvirusYellow fever virus