Concurrent infection with bovine leukaemia virus and <Emphasis Type="Italic">Theileria annulata</Emphasis> in a Friesian calf |
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| Authors: | M Al-Dubaib O H Omer O M Mahmoud M E Hashad |
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| Institution: | (1) Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, Qassim University, P.O. Box 1482, Buraidah, Saudi Arabia |
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| Abstract: | Concurrent infection with bovine leukaemia virus (BLV) and Theileria annulata was diagnosed in a Friesian calf about 6 months of age at a dairy farm at the Qassim region of central Saudi Arabia. The
disease ended fatally with signs of liver and heart failure. There was anorexia, pyrexia, anaemia, generalized oedema and
jaundice. Haematology showed low RBC counts, PCV percentage and haemoglobin concentration and WBC counts. Lymphocyte differential
was high. Examination of blood smears stained with Giemsa’s stain showed the presence of piroplasms in red blood cells. Autopsy
showed enlarged lymph nodes and lymphosarcoma lesions in the omentum and the heart. There was hydroperitoneum, hydropericardium
and hydrothorax. The liver was pale yellow and friable. Impression smears from sliced lymph nodes and stained with Giemsa’s
stain showed presence of Koch’s blue bodies in lymphoblasts. Histopathological examination revealed fatty degeneration of
hepatocytes and pleomorphic lymphoblasts and giant cells in lymph nodes. Lymphoblasts infiltrated the omentum and heart tissues.
Amyloid was found around blood vessels in the liver, kidneys and lymph nodes. BVL infection was diagnosed by demonstrating
antibodies against the virus in serum using agar gel immunodiffusion and was confirmed with ELISA. |
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| Keywords: | Concurrent infection Theileriosis Bovine leukaemia virus |
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