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Information Journal Paper

Title

Immunogenic Evaluation of Bivalent Vaccine Candidate against Enterohemorrhagic and Enterotoxigenic Escherichia coli

Pages

  200-211

Abstract

 Background: Caused by bacterial, viral, and parasitic pathogens, diarrhea is the second leading cause of death among children under five. Two strains of E. coli, namely Enterotoxigenic, ETEC and Enterohemorrhagic EHEC are the most important causes of this disease in developing countries. EHEC is a major causative agent of bloody diarrhea and hemorrhagic uremic syndrome, while ETEC is the most important cause of diarrhea in neonates and travelers. Objectives: To evaluate the immunologic properties of a subunit vaccine candidate comprising the main immunogenic epitopes from these two bacterial strains. Methods: The construct comprised of LTB and CfaB antigens from ETEC, and Intimin and Stx2B antigens from EHEC, was designed, analyzed and synthesized using bioinformatics methods. The chimeric gene was sub-cloned in the expression vector and expressed in E. coli host. The purified chimera protein was injected subcutaneously into the experimental animals. The production of specific antibodies was confirmed by immunological methods, and the protection capacity was evaluated by the challenge of immunized mice with the pathogenic bacteria. Results: Chimeric recombinant protein was able to increase IgG titer. Neutralization assay indicated that the antibodies generated against LtB moiety were able to neutralize ETEC toxin. In animal challenge study, all non-immune mice died within 3 days after the injection of toxin, but all immunized mice survived from Stx toxin. Conclusions: The immunity to both ETEC and EHEC bacteria is significant, and this structure can be considered as a candidate for vaccine production against these bacterial strains.

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    APA: Copy

    Karimi Rahjerdi, Ahmad, JAFARI, MAHYAT, MOTAMEDI, MOHAMMAD JAVAD, AMANI, JAFAR, & SALMANIAN, ALI HATEF. (2019). Immunogenic Evaluation of Bivalent Vaccine Candidate against Enterohemorrhagic and Enterotoxigenic Escherichia coli. IRANIAN JOURNAL OF IMMUNOLOGY (IJI), 16(3), 200-211. SID. https://sid.ir/paper/296972/en

    Vancouver: Copy

    Karimi Rahjerdi Ahmad, JAFARI MAHYAT, MOTAMEDI MOHAMMAD JAVAD, AMANI JAFAR, SALMANIAN ALI HATEF. Immunogenic Evaluation of Bivalent Vaccine Candidate against Enterohemorrhagic and Enterotoxigenic Escherichia coli. IRANIAN JOURNAL OF IMMUNOLOGY (IJI)[Internet]. 2019;16(3):200-211. Available from: https://sid.ir/paper/296972/en

    IEEE: Copy

    Ahmad Karimi Rahjerdi, MAHYAT JAFARI, MOHAMMAD JAVAD MOTAMEDI, JAFAR AMANI, and ALI HATEF SALMANIAN, “Immunogenic Evaluation of Bivalent Vaccine Candidate against Enterohemorrhagic and Enterotoxigenic Escherichia coli,” IRANIAN JOURNAL OF IMMUNOLOGY (IJI), vol. 16, no. 3, pp. 200–211, 2019, [Online]. Available: https://sid.ir/paper/296972/en

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