Parainfluenza Virus 2, HumanParainfluenza Virus 3, HumanRespirovirusParainfluenza Virus 1, HumanParainfluenza Virus 3, BovineParainfluenza Virus 5Paramyxoviridae InfectionsRubulavirus InfectionsParainfluenza VaccinesParainfluenza Virus 4, HumanRespirovirus InfectionsRubulavirusHN ProteinParamyxoviridaeParamyxovirinaeViral Fusion ProteinsRespiratory Syncytial VirusesPoint MutationRespiratory Tract InfectionsSendai virusVirus DiseasesMutation, MissenseVirus ReplicationVirus CultivationViral ProteinsMutationCercopithecus aethiopsRNA VirusesSigmodontinaeMumps virusCell LineVero CellsAntibodies, ViralReceptors, VirusRespiratory Syncytial Virus, HumanVirusesOrthomyxoviridaeMolecular Sequence DataVaccinia virusNeuraminidaseMetapneumovirusCroupRespiratory Syncytial Virus InfectionsRNA, ViralAntigens, ViralViral Plaque AssayVaccines, AttenuatedLaryngitisPneumonia, ViralFrameshift MutationCytopathogenic Effect, ViralHemagglutination Inhibition TestsAmino Acid SequenceVirus AssemblyNeutralization TestsMeasles virusAntiviral AgentsCell FusionNasopharynxBase SequencePolymerase Chain ReactionRespiratory SystemRespiratory Syncytial Virus VaccinesGenes, ViralViral VaccinesHemagglutinins, ViralCricetinaeViral Structural ProteinsHeLa CellsAmino Acid SubstitutionHemadsorptionVaccines, SyntheticGerm-Line MutationVirus SheddingHemagglutinin Glycoproteins, Influenza VirusSimian virus 40Influenza, HumanCallitrichinaeSequence Analysis, DNANucleoproteinsPlant VirusesDNA VirusesTracheitisVirionDefective VirusesPyransGene Expression Regulation, ViralDNA PrimersNucleocapsidPhylogenySindbis VirusHaplorhiniRespiratory Syncytial Virus, BovineFluorescent Antibody TechniqueRecombination, GeneticInfluenza A Virus, H1N1 SubtypePedigreeInfluenza A Virus, H3N2 SubtypeMutagenesis, Site-DirectedGenetic Vectors