dentification of cross-protective tick vaccine antigens is a challenging area of veterinary research. To
address this challenge, a recently identified candidate tick protective antigen, Subolesin (SUB), was targeted in this research. The conservation of subolesin ortholog of Hyalomma anatolicum and Rhipicephalus
(Boophilus) microplus across different Indian strains was 98.1–99.4% (within species), while at the amino
acid level SUB sequence homology was ≥53.2% (between tick species). Recombinant R. (B.) microplus SUB
(rBmSu) was produced in Escherichia coli and characterized. Cross-bred cattle male calves (N = 10) were
immunized with three doses of 100 g each of the rBmSu emulsified in 10% Montanide 888 at monthly
intervals on days 0, 30 and 60. The control group was injected with PBS in 10% Montanide 888.