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Response of crossbred calves to immunization with Theileria annulata Schizont infected lymphoid cell cultures



Response of crossbred calves to immunization with Theileria annulata Schizont infected lymphoid cell cultures



Indian Veterinary Journal 70(7): 605-608



A cell line of Theileria annulata schizont-infected bovine lymphoid cells was established and grown in vitro for 453 passages (2038 days). At different passage intervals viz. 12, 27, 48, 100 and 150, the culture-derived cells were test-inoculated into experimental crossbred calves which were subsequently challenged with Ground Up Tick Supernates (GUTS) prepared from T. annulata infected Hyalomma anatolicum anatolicum ticks. Virulence of Theilerial schizonts was reduced with passaging. Calves receiving 5 times 10-6 schizont infected lymphoid cells at 150 passage (675 days of cultivation) had minimum post inoculation reactions and could withstand virulent challenge of T. annulata infective GUTS given on day 47 post inoculation. It is concluded that T. annulata schizont infected bovine lymphoid cell cultures of Anand isolate at 150 passage could be effectively used for immunizing cattle against tropical theileriosis.

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Accession: 009347597

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