Effect of vaccination in the field with the Theileria annulata (Hisar) cell culture vaccine on young calves born during the winter season

Khatri, Neeraj and Nichani, A.K. and Sharma, R.D. and Khatri, M. and Malhotra, D.V. (2001) Effect of vaccination in the field with the Theileria annulata (Hisar) cell culture vaccine on young calves born during the winter season. Veterinary Research Communications, 25 (3). pp. 179-188. ISSN 01657380

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Abstract

The responses were monitored of young crossbred calves vaccinated against tropical theileriosis during the winter against a ¢eld tick challenge in the disease season. Thirty-eight calves below 2 months of age, born after the end of the disease season, were selected at an organized farm. Twenty-¢ve animals were vaccinated with Theileria annulata (Hisar) cell culture vaccine (developed at CCS HAU Hisar laboratory) after the end of the disease season and 13 calves were kept as non-vaccinated controls. These calves were observed for their susceptibility to theileriosis in the new disease season. There was an increase in antibody titre in 18 of the 25 vaccinated animals one month after vaccination. The antibody titre then declined gradually, but remained higher than those of the non-vaccinated animals at month 0. No fever or other clinical signs of tropical theileriosis were observed in any of the vaccinated animals. Nine out of 25 (36%) vaccinated calves showed occasional piroplasms (50.5%) in blood smears. All the vaccinated animals withstood the ¢eld tick challenge. On the other hand, 9 of the 13 (69%) unvaccinated calves exhibited occasional piroplasms, and included three clinical cases of tropical theileriosis. These observations suggest that young crossbred calves vaccinated with the T. annulata (Hisar) cell culture vaccine at the end of the disease season were relatively resistant during the next disease season.

Item Type:	Article
Additional Information:	Copyright of this article belongs to Springer Science.
Uncontrolled Keywords:	antibodies, cattle, ¢eld challenge, piroplasms, season, theileriosis, vaccine
Subjects:	R Medicine > RZ Other systems of medicine
Depositing User:	Dr. K.P.S.Sengar
Date Deposited:	03 Feb 2012 05:52
Last Modified:	22 Jul 2015 05:17
URI:	http://crdd.osdd.net/open/id/eprint/855

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