Defective VirusesInfluenza A virusVirus ReplicationInfluenza, HumanInfluenza A Virus, H1N1 SubtypeMurine Acquired Immunodeficiency SyndromeHemagglutinin Glycoproteins, Influenza VirusInfluenza A Virus, H5N1 SubtypeInfluenza A Virus, H3N2 SubtypeInfluenza VaccinesOrthomyxoviridaeInfluenza in BirdsOrthomyxoviridae InfectionsInfluenza B virusRNA, ViralViral ProteinsRNA VirusesCell LineHelper VirusesVaccinia virusGenes, ViralDNA, ViralVirus CultivationReceptors, VirusMolecular Sequence DataVirus SheddingViral InterferenceNeuraminidaseHemagglutinins, ViralVirus AssemblyAntiviral AgentsVirus DiseasesHemagglutination Inhibition TestsAntigens, ViralSindbis VirusGenome, ViralLeukemia Virus, MurineInfluenza A Virus, H9N2 SubtypeAntibodies, ViralSimian virus 40Plant VirusesDNA VirusesInfluenza A Virus, H7N7 SubtypeVirionParticle SizeBirdsDucksMeasles virusVero CellsBase SequenceReassortant VirusesInfluenza A Virus, H3N8 SubtypeHepatitis B virusViral Plaque AssayPandemicsRabies virusGene Expression Regulation, ViralInfluenza A Virus, H5N2 SubtypeRespiratory Syncytial VirusesCercopithecus aethiopsVesicular stomatitis Indiana virusWest Nile virusAmino Acid SequenceMutationOseltamivirPhylogenyVirus ActivationDogsMadin Darby Canine Kidney CellsDisease OutbreaksRNA ReplicaseNeutralization TestsSimian immunodeficiency virusCytopathogenic Effect, ViralInfluenza A Virus, H1N2 SubtypeVirus LatencyGenetic Complementation TestFerretsInfluenza A Virus, H7N9 SubtypeViral Core ProteinsVirulenceHost-Pathogen InteractionsInfluenza A Virus, H2N2 SubtypeCells, CulturedNucleoproteinsChickensVirus AttachmentParainfluenza Virus 1, HumanRecombination, GeneticHIV-1HeLa CellsSemliki forest virusPlasmidsGenetic VectorsCapsidOncogenic VirusesCricetinaeVirus InactivationChick EmbryoVaccination