Abstract
In the present study, immunogenicity and protective efficacy of the Brucella outer membrane protein 2b (Omp2b) was evaluated in BALB/c mice using Protein/Protein, DNA/DNA and DNA/Protein vaccine strategies. Immunization of mice with three vaccine regimens elicited a strong specific IgG response (higher IgG2a titers over IgG1 titers) and provided Th1-oriented immune response. Vaccination of BALB/c mice with the DNA/Pro regimen induced higher levels of IFN-γ/IL-2 and conferred more protection levels against B. melitenisis and B. abortus challenge than did the protein or DNA alone. In conclusion, Omp2b is able to stimulate specific immune responses and to confer cross protection against B. melitensis and B. abortus infection. Therefore, it could be introduced as a new potential candidate for the development of a subunit vaccine against Brucella infection.
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