Serial PassageVirus CultivationDefective VirusesVirus ReplicationVirulenceViral InterferenceCell LineMutationMolecular Sequence DataBase SequenceCytopathogenic Effect, ViralGenome, ViralRNA, ViralViral Plaque AssayGenes, vpuCallitrichinaeCercopithecus aethiopsAdaptation, BiologicalCells, CulturedHelper VirusesNeoplasm TransplantationCricetinaeGenetic VariationCulture MediaDNA, ViralPhenotypeFoot-and-Mouth Disease VirusTime FactorsVero CellsReassortant VirusesHepatovirusCulture TechniquesMicrobial Sensitivity TestsHaplorhiniSerial LearningViral ProteinsDrug Resistance, MicrobialRepliconOrthomyxoviridaeViral VaccinesAmino Acid SequenceTransplantation, HeterologousFoot-and-Mouth DiseaseAnti-Bacterial AgentsVaccines, AttenuatedAdaptation, PhysiologicalAphthovirusPrPSc ProteinsPoliovirusGenes, ViralMesocricetusAmino Acid SubstitutionAntigens, ViralRecombination, GeneticDrug Resistance, BacterialSequence Analysis, DNACattleSpecies SpecificityDogsSelection, GeneticDNA PrimersKidneyScrapieCapsidChick EmbryoClone CellsPolymerase Chain ReactionNeoplasms, ExperimentalDrug Resistance, ViralCloning, MolecularHIV-1Cell DivisionDisease Models, AnimalBrainMicroscopy, ElectronNucleopolyhedrovirusSimian virus 40RNA, Ribosomal, 23SGenetic VectorsCapsid ProteinsMutagenesisStaphylococcus aureusFibroblastsViral Envelope ProteinsL Cells (Cell Line)VirionVirus AssemblySequence DeletionTemperatureSwineFluorescent Antibody TechniqueGenetic EngineeringReverse Transcriptase Polymerase Chain ReactionSimian immunodeficiency virusMice, NudeMice, Inbred BALB CSheepFluoroquinolonesDNA Restriction EnzymesKinetics