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An infectious agent was isolated from leg tendons of broiler breeders with clinical tenosynovitis. The agent grew well on the chorioallantoic membrane (CAM) of embryonating chicken eggs and was filterable through a 0.22-Ft filter. Typical gross and microscopic lesions of tenosynovitis could be reproduced in broiler chicks via oral, subcutaneous, or intra-abdominal routes, as well as in contact control chicks. Precipitating antibodies against the homologous agent as well as two other avian reoviruses were present beginning 14 days postinoculation. Negative control chicks developed no lesions or antibodies. The isolate showed antigenic identity with three known avian reoviruses when tested against antiserum in the agar-gel precipitin (AGP) test.

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