Influenza, HumanPandemicsInfluenza A Virus, H1N1 SubtypeInfluenza A virusInfluenza A Virus, H5N1 SubtypeInfluenza VaccinesHemagglutinin Glycoproteins, Influenza VirusInfluenza A Virus, H3N2 SubtypeOrthomyxoviridae InfectionsInfluenza in BirdsNeuraminidaseVirus ReplicationDisease OutbreaksVaccinia virusInfluenza B virusRNA VirusesFerretsReassortant VirusesAntibodies, ViralReceptors, VirusBirdsOrthomyxoviridaeCross ProtectionHemagglutination Inhibition TestsVirus CultivationVirus SheddingAntiviral AgentsInfluenza A Virus, H9N2 SubtypeVirus DiseasesPhylogenyMolecular Sequence DataHemagglutinins, ViralAntigens, ViralRNA, ViralCell LineViral ProteinsMeasles virusInfluenza A Virus, H7N9 SubtypeVirus AssemblyPlant VirusesSimian virus 40VirulenceDefective VirusesSindbis VirusDNA VirusesRabies virusGenes, ViralRespiratory Syncytial VirusesWest Nile virusOseltamivirHepatitis B virusHistory, 20th CenturyDogsNeutralization TestsInfluenza A Virus, H7N7 SubtypeAntibodies, NeutralizingVero CellsSequence Analysis, DNAAmino Acid SequenceCercopithecus aethiopsSwine DiseasesViral Plaque AssayDNA, ViralVesicular stomatitis Indiana virusInfluenza A Virus, H2N2 SubtypeVirus ActivationSwineMumps virusSimian immunodeficiency virusRespiratory Syncytial Virus InfectionsMice, Inbred BALB CVirionSpecies SpecificityVirus LatencyInfluenza A Virus, H5N2 SubtypeChickensVaccinationSeasonsDucksPolymerase Chain ReactionTumor Virus InfectionsHepatitis A virusParainfluenza Virus 1, HumanVirus AttachmentInfluenza A Virus, H1N2 SubtypeInfluenza A Virus, H3N8 SubtypeOncogenic VirusesMosaic VirusesVaccines, AttenuatedSemliki forest virusCross ReactionsCytopathogenic Effect, ViralGene Expression Regulation, ViralCowpox virusHIV InfectionsInfluenza A Virus, H7N1 SubtypeVaccines, InactivatedEpstein-Barr Virus InfectionsDisease Models, AnimalVirology