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Naturally Acquired Infectious Canine Hepatitis in Two Captive Maned Wolf (Chrysocyon brachyurus) Puppies.
Journal of Comparative Pathology 2021 July
We report the clinicopathological manifestations of canine adenovirus type 1 (CAV 1) infection in captive-born naturally infected maned wolves (Chrysocyon brachyurus). Two 3-month-old maned wolves presented with lethargy, emesis, dehydration, pallor, hypothermia, leucocytosis, neutrophilia, lymphopaenia and thrombocytopaenia. One of the puppies died shortly after admission, with gross changes that included marked gastrointestinal petechiae, splenomegaly, hepatomegaly and pulmonary haemorrhage. Histologically, large eosinophilic intranuclear body inclusions were found in the liver and kidneys. The other wolf had elevated alkaline phosphatase, alanine aminotransferase and creatine kinase activities, and later developed anaemia, hypoalbuminaemia, bilirubinaemia, bilirubinuria, haematuria and proteinuria. Ultrasound demonstrated hepatomegaly, splenomegaly, inguinal lymphadenomegaly and lesions suggestive of gastritis and enteritis. Despite supportive treatment, the animal died. At necropsy, there was icterus, subcutaneous oedema in the inguinal region and hindlimbs, subchondral haemorrhage of articular cartilage of the femoral-tibial-patellar and tarsal joints of both hindlimbs, lymphadenomegaly, bronchopneumonia, hepatomegaly and petechiae in the gastrointestinal mucosa. Microscopically, there was a severe necrotizing hepatitis with intranuclear viral inclusions, fibrinous-necrotizing splenitis, non-suppurative meningoencephalitis and interstitial nephritis. A quantitative PCR test for CAV 1 using DNA extracted from peripheral blood was positive. The clinicopathological findings are similar to those of CAV 1 infection in dogs and other canids.
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