Serial PassageVirus CultivationDefective VirusesVirus ReplicationVirulenceViral InterferenceCell LineMutationCytopathogenic Effect, ViralBase SequenceMolecular Sequence DataGenome, ViralRNA, ViralViral Plaque AssayGenes, vpuCallitrichinaeCercopithecus aethiopsAdaptation, BiologicalCells, CulturedHelper VirusesCricetinaeNeoplasm TransplantationCulture MediaGenetic VariationDNA, ViralFoot-and-Mouth Disease VirusPhenotypeTime FactorsReassortant VirusesVero CellsCulture TechniquesHepatovirusMicrobial Sensitivity TestsSerial LearningHaplorhiniViral ProteinsDrug Resistance, MicrobialRepliconOrthomyxoviridaeViral VaccinesFoot-and-Mouth DiseaseTransplantation, HeterologousAdaptation, PhysiologicalVaccines, AttenuatedAnti-Bacterial AgentsAphthovirusAmino Acid SequencePrPSc ProteinsPoliovirusGenes, ViralMesocricetusAntigens, ViralDrug Resistance, BacterialSequence Analysis, DNACattleRecombination, GeneticDogsAmino Acid SubstitutionSpecies SpecificityKidneyMicroscopy, ElectronSelection, GeneticScrapieDNA PrimersChick EmbryoCapsidDrug Resistance, ViralClone CellsNeoplasms, ExperimentalPolymerase Chain ReactionCell DivisionDisease Models, AnimalBrainNucleopolyhedrovirusHIV-1Cloning, MolecularRNA, Ribosomal, 23SSimian virus 40Viral Envelope ProteinsFibroblastsCapsid ProteinsStaphylococcus aureusL Cells (Cell Line)MutagenesisGenetic VectorsSwineVirionVirus AssemblyTemperatureFluorescent Antibody TechniqueSheepSimian immunodeficiency virusGenetic EngineeringReverse Transcriptase Polymerase Chain ReactionMice, Inbred BALB CMice, NudeSequence DeletionFluoroquinolonesRabbitsHeLa Cells