Defective VirusesInfluenza A virusInfluenza, HumanInfluenza A Virus, H1N1 SubtypeInfluenza VaccinesHemagglutinin Glycoproteins, Influenza VirusInfluenza A Virus, H3N2 SubtypeInfluenza in BirdsInfluenza A Virus, H5N1 SubtypeOrthomyxoviridaeOrthomyxoviridae InfectionsInfluenza B virusMurine Acquired Immunodeficiency SyndromeVirus ReplicationNeuraminidaseHemagglutinins, ViralInfluenza A Virus, H9N2 SubtypeHemagglutination Inhibition TestsRNA, ViralViral ProteinsInfluenza A Virus, H3N8 SubtypeVirus SheddingRNA VirusesHelper VirusesCell LineBirdsVirus CultivationInfluenza A Virus, H7N7 SubtypeReceptors, VirusReassortant VirusesVaccinia virusPandemicsGenes, ViralAntibodies, ViralDucksInfluenza A Virus, H5N2 SubtypeViral InterferenceOseltamivirMolecular Sequence DataAntiviral AgentsInfluenza A Virus, H2N2 SubtypeAntigens, ViralVirus DiseasesDisease OutbreaksMadin Darby Canine Kidney CellsInfluenza A Virus, H1N2 SubtypeDNA, ViralVirus AssemblyInfluenza A Virus, H7N9 SubtypeDogsFerretsSimian virus 40PoultryLeukemia Virus, MurinePhylogenyParticle SizePlant VirusesDNA VirusesGenome, ViralChickensNucleoproteinsVaccinationVirionVaccines, InactivatedSeasonsAmantadineZanamivirSindbis VirusMeasles virusNeutralization TestsRespiratory Syncytial VirusesRNA ReplicaseCross ProtectionViral Core ProteinsRabies virusViral Plaque AssayViral Matrix ProteinsAnseriformesChick EmbryoVaccines, AttenuatedPneumonia, ViralVirus InactivationVirulenceHemagglutininsInfluenzavirus AVirologySwine DiseasesCercopithecus aethiopsAmino Acid SequenceVesicular stomatitis Indiana virusHemagglutination, ViralCross ReactionsHepatitis B virusVirus AttachmentVero CellsPoultry DiseasesSwineWest Nile virusBase SequenceVirus Activation