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Immunoprotective efficacy of a purified 39 kDa nymphal antigen of Hyalomma anatolicum anatolicum
, S. Ghosh, M. Khan H., G. Das
Published in
Volume: 33
Issue: 2
Pages: 103 - 116
Soluble nymphal antigens (HNAg) were purified by immunoaffinity chromatography using CNBr-activated Sepharose 4B coupled with immunoglobulin ligands from animals immunized with HNAg and 69-71% protected against challenge infestations and 8% recovery of the purified protein (Aff-HNAg) was obtained. Following immunization of crossbred calves (Bos indicus × Bos taurus) with 1600 $\mu$g of Aff-HNAg in three divided doses, significant rejections of larvae (p < 0.001, 84.2%), nymphs (p < 0.05, 61.4%) and adults (p < 0.05, 58.7%) were recorded. No significant changes were recorded in the engorgement weights of the larvae and nymphs, but there was a significant (p < 0.05) reduction in the weight of the engorged adults. Immunization conferred a significant decrease in the numbers of resultant nymphs (p < 0.001) and adults (p < 0.001) that had fed on the immunized animals. SDS-PAGE analysis identified a 39 kDa protein, previously isolated from larvae of Hyalomma anatolicum anatolicum, as the antigen responsible for the induction of resistance against all the stages of the tick.
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