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Viral arthritis is an infectious condition in chickens and to a lesser extent, turkeys, due to a reovirus.
The disease is egg-transmitted.
The prominent symptom is a swelling of digital flexor and metatarsal extensor tendons. The hock joint itself is not so sharply affected, showing just a small amount of synovial exsudate when opened.
References
Viral arthritis (poultry) Wikipedia(Text) CC BY-SA