An outbreak of acute trypanosomosis caused by Trypanosoma evansi in Punjab, a northern state of India was investigated in a cattle farm comprising 78 adults (lactating and dry) and 27 calves. The outbreak in the affected animals exhibiting high fever (1058F), circling, tremors, convulsions and death within 24Á48 hours was confirmed based on examination of Wright-Giemsa stained blood smears, morpho-metric measurements and by polymerase chain reaction by using T. evansi specific primers yielding species specific 227 bp PCR product. Pretreatment parasitaemia estimated in three clinical cases revealed 12.5 )10 4 , 11.2 )10 4 and 16.7 )10 4 tryps/ml of blood and cow that was treated with isometamedium chloride revealed parasitemia of 1.4 )10 4 tryps/ml of blood 24 hours after treatment while no parasitemia was found after 24 hrs of treatment in other two cows, treated with quinapyramine sulphate and chloride combination (Triquin). Post-mortem revealed moderate enlargement of spleen. Biochemical parameters revealed increase in cholesterol, bilirubin and total proteins.
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