| Avian orthoreovirus | |
|---|---|
Virus classification 
| |
| (unranked): | Virus |
| Realm: | Riboviria |
| Kingdom: | Orthornavirae |
| Phylum: | Duplornaviricota |
| Class: | Resentoviricetes |
| Order: | Reovirales |
| Family: | Sedoreoviridae |
| Genus: | Orthoreovirus |
| Species: | Avian orthoreovirus
|
Avian orthoreovirus, also known as avian reovirus, is an orthoreovirus from the Reoviridae family. Infection causes arthritis and tenosynovitis in poultry. It can also cause respiratory disease.
Avian orthoreovirus infection is more common in young birds, because resistance begins to develop from as young as two weeks of age. It is also reportedly more common in broilers. Distribution of avian orthoreovirus is worldwide and it is present in most poultry flocks. It can be transmitted horizontally via the faeces or rarely, vertically. It is not a zoonosis.
The most common symptom is lameness. There may also be swelling or bleeding around the joints. Gastrointestinal, respiratory and neurological signs have also been reported.
Presumptive diagnoses may be made based on the observation of clinical signs. They can be confirmed using virus isolation, complement fixation, ELISA, immunodiffusion or histopathology (following postmortem exam).