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Summary Resistance to infestation by Hyalomma anatolicum and H. dromedarii adults was induced in rabbits by repeated infestations. Sera from rabbits repeatedly infested with adults of H. anatolicum and H. dromedarii were tested for the presence of anti-tick antibodies to tick–derived crude soluble salivary gland antigens (CSSGAs) by enzyme-linked immunosorbant assay (ELISA). The ELISA demonstrated anti-tick antibody titres that increased with repeat infestation of both tick species. The increase in antibody titres was highly negatively correlated with female engorgement weights and highly positively correlated with infestation frequency of both tick species. Rabbits’ resistance, which interferes with tick feeding, was expressed in reduction in tick engorgement weight, egg mass weight, hatchability percentage of eggs, and prehatching period and prolongation of feeding period. Cross–reactivity between crude soluble salivary gland antigens (CSSGAs) of H. anatolicum and H. dromedarii was demonstrated by ELISA.

 
 
   
 
 

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