Cytopathogenic Effect, ViralTrichomonasDiarrhea Viruses, Bovine ViralTorovirus InfectionsBovine Virus Diarrhea-Mucosal DiseasePestivirusClassical swine fever virusPeptide Nucleic AcidsRNA HelicasesTissue Culture TechniquesVirusesChicken anemia virusVirus CultivationGenome, ViralDefective VirusesRNA, ViralViral Nonstructural ProteinsCattlePeptide HydrolasesCell LineResearchNucleic Acid ConformationMolecular Sequence DataNucleic Acid ProbesBase SequenceNucleic Acid Amplification TechniquesVirus ReplicationCulture Techniques