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VIRUSES



Introduction

Reoviridae include rotaviruses and orbiviruses, such as African Horse Sickness and Bluetongue. Pathogenesis ranges from acute alimentary infections to infections of the vascular endothelium. "REO" stands for "Respiratory-Enteric-Orphan."

Morphology

  • All are non-enveloped dsRNA viruses
  • Spherical and medium-sized with characteristic appearances
  • Segmented genome, with each segment encoding a separate viral protein

Virulence and Pathogenesis

  • Reoviridae are resistant viruses that can persist in the environment for several weeks

Epidemiology

  • Many reoviruses infect domestic animals without causing disease
  • They have been implicated in stunting syndrome of chickens

Types and Subtypes

Rotaviruses

Orbiviruses

Bluetongue Virus

African Horse Sickness