Influenza A virusInfluenza, HumanInfluenza A Virus, H1N1 SubtypeOrthomyxoviridae InfectionsNeuraminidaseHemagglutinin Glycoproteins, Influenza VirusInfluenza A Virus, H1N2 SubtypeInfluenza A Virus, H3N2 SubtypeSwine DiseasesSwineInfluenza VaccinesReassortant VirusesHemagglutinins, ViralInfluenza in BirdsInfluenza A Virus, H5N1 SubtypeOrthomyxoviridaeHemagglutininsHemagglutination Inhibition TestsInfluenza B virusBirdsPandemicsAntibodies, ViralInfluenza A Virus, H9N2 SubtypePhylogenyMolecular Sequence DataVirus SheddingVirus ReplicationReceptors, VirusPneumonia, ViralDisease OutbreaksZoonosesInfluenza A Virus, H2N2 SubtypeAntigens, ViralOseltamivirInfluenza A Virus, H3N8 SubtypeViral ProteinsInfluenza A Virus, H7N9 SubtypeZanamivirInfluenza A Virus, H7N7 SubtypeRNA, ViralCell LineVacuolar Proton-Translocating ATPasesProdigiosinAntiviral AgentsFerretsSequence Analysis, DNAGenes, ViralVaccinia virusCross ReactionsDogsAntigenic VariationInfluenza A Virus, H5N2 SubtypeN-Acetylneuraminic AcidVirus CultivationDucksAmino Acid SequenceRNA VirusesVirulenceChick EmbryoAntifoaming AgentsLungMadin Darby Canine Kidney CellsSialic AcidsChickensHemagglutination, ViralVaccinationMacrolidesPoultryPyransSeasonsProton-Translocating ATPasesPorcine respiratory and reproductive syndrome virusMeasles virusVirus DiseasesVaccines, InactivatedChinaViral Matrix ProteinsAmantadineNeutralization TestsSpecies SpecificityVirus AssemblyMice, Inbred BALB CAntibodies, NeutralizingCross ProtectionInfluenza A Virus, H7N1 SubtypeDefective VirusesHemagglutination TestsGenome, ViralVirologySimian virus 40Viral Plaque AssayHydrogen-Ion ConcentrationVaccines, AttenuatedNucleoproteinsVacuolesEnzyme-Linked Immunosorbent AssayBase SequenceHemagglutinationMutationEvolution, Molecular