The term "companion bird" in this article includes parrots, pigeons, canaries, and finches. Many viruses are known to cause disease in companion birds and have been well-studied. Other avian viruses have not been well-studied and some are not yet classified; probably others exist that have not been discovered because not all known viral families have been documented in birds. The following viral families are discussed alphabetically: Adenoviridae, Circoviridae, Coronaviridae, Flaviviridae, Herpesviridae, Orthomyxoviridae, Papovaviridae, Poxviridae, Reoviridae, Retroviridae, Rhabdoviridae, Togaviridae, and a virus from an unclassified virus family, pro ventricular dilatation disease. When appropriate, each virus family includes a description of the virus, the species affected, the transmission route and recommended type of disinfection, clinical signs, diagnosis, treatment, prognosis, and prevention modalities available.
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