Forty six (46) clinical cases of lethal theileriosis in buffaloes around Livestock Production Research Institute, Bahadurnagar (Okara) were identified microscopically using field’s stained blood smears. Clinical features of the disease were manifested by high rise of body temperature 104.8 ± 1.2, enlarged lymph nodes at parotid, inability to walk, anorexia, listlessness, moderate anaemia and in few cases cornial opacity. There were marked decline (P<0.01) in the Haemoglobin (Hb) 8.28 ± 1.81 gm/dl, Total Erythrocytic Count (TEC) 4.14 ± 0.7x106 /ul, Packed Cell Volume (PCV) 22.10 ± 0.8 percent and Total Leukocytic Count (TLC) 4.95 ± 1.05x 103 /ml, respectively. Erythrocytic Sedimentation Rate (ESR) was significantly increased (P<0.01) up to 103.5 ± 12.4 mm/Ist hour. The percentage of Neutrophils increased 61.75 ± 2.77 and Lymphocytes decreased drastically 28.69 ± 1.45 as compared with un-infected buffaloes. Buparvaquone (Butalex) was found drug of choice and buffaloes recovered from the disease due to early diagnosis and treatment. Necropsy findings revealed excessive fluid in the peritoneal and pleural cavity. Haemorrhagic ulcerations of abomasums and necrotic spots on the serosal surface of the small intestine were noticed
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