Defective VirusesInfluenza A virusInfluenza, HumanMurine Acquired Immunodeficiency SyndromeInfluenza A Virus, H1N1 SubtypeInfluenza VaccinesHemagglutinin Glycoproteins, Influenza VirusInfluenza A Virus, H3N2 SubtypeInfluenza A Virus, H5N1 SubtypeInfluenza in BirdsOrthomyxoviridaeVirus ReplicationOrthomyxoviridae InfectionsInfluenza B virusHelper VirusesViral ProteinsGenes, ViralRNA, ViralCell LineViral InterferenceNeuraminidaseVaccinia virusMolecular Sequence DataHemagglutinins, ViralRNA VirusesDNA, ViralVirus CultivationVirus SheddingLeukemia Virus, MurineInfluenza A Virus, H9N2 SubtypeReceptors, VirusHemagglutination Inhibition TestsMutationInfluenza A Virus, H3N8 SubtypeAntibodies, ViralBirdsInfluenza A Virus, H7N7 SubtypeAntiviral AgentsGenome, ViralVirus AssemblyPandemicsGenetic Complementation TestAntigens, ViralReassortant VirusesVirus DiseasesSindbis VirusDucksInfluenza A Virus, H5N2 SubtypeBase SequenceSimian virus 40Viral Plaque AssayOseltamivirDisease OutbreaksInfluenza A Virus, H2N2 SubtypeInfluenza A Virus, H1N2 SubtypeDogsMadin Darby Canine Kidney CellsDNA VirusesPlant VirusesCercopithecus aethiopsInfluenza A Virus, H7N9 SubtypeAmino Acid SequenceVirulenceVesicular stomatitis Indiana virusVirionPhylogenyVero CellsFerretsMeasles virusHepatitis B virusNeutralization TestsChick EmbryoRabies virusRespiratory Syncytial VirusesPoultryViral Core ProteinsChickensAvian Sarcoma VirusesVaccines, AttenuatedVaccinationNucleoproteinsTemperatureSemliki forest virusVaccines, InactivatedWest Nile virusAmantadineRNA ReplicaseSeasonsAmino Acid SubstitutionGene Expression Regulation, ViralViral Matrix ProteinsZanamivirVirus ActivationVirus InactivationRecombination, GeneticVirus AttachmentCross ProtectionSwineCricetinaeCells, Cultured