Inflammation of several joints. More common in very young animals because of the frequency of navel infection and bacteremia and the immaturity of the arthrodial tissues. See also arthritis.
- chlamydial p. — caused by Chlamydophila pecorum and characterized by joint enlargement, lameness, stiff gait, fever, conjunctivitis, a high morbidity and mortality in young animals. There are also lesions and signs of involvement of other organs, e.g. pneumonia, encephalomyelitis and interstitial focal nephritis. An important disease of feedlot lambs.
- chronic villous p. — chronic inflammation of the synovial membrane of several joints.
- crystal-induced p. — see gout, pseudogout.
- feline chronic progressive p. — see periosteal proliferative polyarthritis (below).
- Greyhound p. — an erosive joint disease of unknown etiology occurring in young Greyhounds. See greyhound polyarthritis.
- immune-mediated p. — see immune-mediated arthritis.
- inherited p. — a disease of young Akita dogs, in which there is sytemic illness with fever, lethargy and peripheral lymphadenopathy, as well as polyarthritis.
- p.–meningitis syndrome — an immune-mediated, nonerosive polyarthritis, seen in Weimaraners and several other breeds. There is fever and spinal pain.
- mycoplasmal p. — Mycoplasma hyorhinis and M. hyosynoviae cause polyarthritis in pigs, the first in suckling pigs in which there may also be a serositis, the latter more common in older growing pigs. M. agalactiae bovis causes polyarthritis in feedlot cattle, M. mycoides var. capri causes polyarthritis and serositis in goats and M. capricolum causes polyarthritis in goats and sheep.
- periosteal proliferative p. — occurs in young, adult male cats as an acute, febrile illness accompanied by severe joint pain and stiffness, followed by generalized stiffness, swollen joints and akylosis. The disease is believed to be immune-mediated and associated with infection by feline leukemia virus and feline syncytium-forming virus. In a variant form, the onset is insidious and the joint changes are erosive and deforming. Called also Reiter's disease.
- p.-polymyositis — an immune-mediated, nonerosive polyarthritis seen in spaniels. There is a chronic myositis with muscle atrophy.