en 39606679 <p style="text-align:justify"><span style="font-size:11pt"><strong><span style="font-size:10.0pt">Background:</span></strong><span style="font-size:10.0pt"> Brucellosis in livestock and its transmission to humans through the consumption of contaminated dairy products is </span><span style="font-size:10.0pt">an </span><span style="font-size:10.0pt">important issue. The introduction of new approaches using immunogenic proteins against and diagnosing brucellosis is a serious</span> <span style="font-size:10.0pt">issue in human health. </span></span></p> <p style="text-align:justify"><span style="font-size:11pt"><strong><span style="font-size:10.0pt">Methods:</span></strong><span style="font-size:10.0pt"> <em>Brucella abortus</em> contains five proteins including: MOXR family ATPase-&alpha;2, T9SS C-terminal target domain-containing protein, Cobyric acid synthase, Hypothetical protein, and VirB11 type IV Secretion protein, which were considered and the designed recombinant polypeptide was produced and evaluated. The pure recombinant protein ABOR with 549aa in combination with chitin as an adjuvant was injected subcutaneously into guinea pigs to evaluate their immunity responses. </span></span></p> <p style="text-align:justify"><span style="font-size:11pt"><strong><span style="font-size:10.0pt">Results:</span></strong><span style="font-size:10.0pt"> The results indicated that the ABOR recombinant protein induced Th1 immunity with high levels of specific IgG (IgG2a) as well as Interferon-&gamma; (IFN-&gamma;), Interleukin-2 (IL-2), IL-12, and Tumor Necrosis Factor-alpha (TNF-&alpha;), compared to the control group. Th1/Th2 ratio analysis demonstrated the efficacy of ABOR protein combined with chitin in stimulating cellular immunity in the animals. </span></span></p> <p style="text-align:justify"><span style="font-size:11pt"><strong><span style="font-size:10.0pt">Conclusion:</span></strong><span style="font-size:10.0pt"> Designed recombinant polypeptide combined with chitin showed ability for induction of cellular and humoral immunity an guinea pigs compared to RB51 vaccine.</span></span></p> Brucella abortus, Guinea pigs, Immunity, Recombinant proteins 251 259 https://www.ajmb.org/En/Article.aspx?id=60592 https://www.ajmb.org/PDF/En/FullText/60592.pdf MinaSaadatDepartment of Medical Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran92253MojganBandehpourDepartment of Embryology and Andrology, Avicenna Research Institute, ACECR, Tehran, Iran390BahramKazemiCellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran388NarimanMosaffaDepartment of Immunology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran92255