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Journal of Veterinary MedicineBroiler ChickensPolymerase Chain ReactionMolecular CharacterisationMolecular DetectionPhylogenetic AnalysisEscherichia ColiFaecal SamplesClinical SignsSmall RuminantsSmall Animal ClinicBlood Biochemical ParametersFeed Conversion RatioVeterinary MedicineAntimicrobial ResistanceSubclinical MastitisBlood SamplesAvian InfluenzaPrevalence RateBursa of Fabricius