author(s)
KB Ashok Kumar Reddy and M Lakshman

abstract
A nine (9) year old Jersey crossbred cow carcass was presented for necropsy to local veterinary dispensary with a history of inappetance, pyrexia (106⁰F), lacrimation, decreased milk production, lethargy, dark brown coloured urine and prolonged lateral recumbency. On necropsy, petechial conjunctiva, pallor visible mucosa and enlarged prescapular lymph node were observed. Smears (blood and lymph node aspirate) and lymph node tissue sections were stained with wright-giemsa and haematoxylin-eosin stain respectively at Department of Veterinary Pathology, College of Veterinary Science, Rajendranagar, Hyderabad. Cytologically, smears showed presence of pleomorphic piroplasms in erythrocytes and schizonts in mononuclear cells. Histopathologically, lymph node sections revealed depleted lymphocytes in cortical lymphoid follicles, lymphocyte proliferation and degenerated high endothelial venules in paracortex. Medulla showed distended sinuses with endothelial degeneration and distorted cords with decreased cell density. In conclusion, the findings noticed in the present paper revealed that Theileriosis caused by T. annulata is associated with lymphoid tissue alterations.