Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (6): 1689-1699.doi: 10.11843/j.issn.0366-6964.2021.06.023

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Immunogenicity Analysis and Protective Effects of CbpB Protein of Erysipelothrix rhusiopathiae in Mice

LIU Junwen1, WU Qiongjuan1, XING Gang2, ZHAN Songhe3, WEI Jianzhong1, SUN Pei1, LIU Xuelan1, LI Yu1*   

  1. 1. College of Animal Science and Technology, Anhui Agricultural University, Heifei 230036, China;
    2. Maanshan Shiji Animal Health Management Co., Ltd, Maanshan 238251, China;
    3. Anhui Animal Disease Prevention and Control Center, Hefei 230091, China
  • Received:2020-06-29 Online:2021-06-23 Published:2021-06-22

Abstract: This study aimed to explore the immunogenicity and protective effects of CbpB protein of Erysipelothrix rhusiopathiae, and to provide new ideas and technical reserves for the further development of ER genetic engineering subunit vaccine. Mice were immunized with the expressed ER recombinant proteins CbpB, SpaA, CbpB+SpaA, ER inactivated whole cell (V-AEr21), commercial attenuated vaccine, and commercial inactivated vaccine, respectively. Indirect ELISA was used to detect the level of IgG antibodies. The challenge test was selected to determine the immune protection rate. Tissue bacteria count test was conducted to determine ER colonization. Mouse tissue organs (spleen, lung, liver, and kidney) were collected to prepare slices and observe pathological changes. Compared with the commercial attenuated vaccine with the strongest immunogenicity, the IgG antibody produced by CbpB and SpaA was only 1:6 400, but the bactericidal efficacy of serum was high. The immune challenge protection rate of mice was the same as that of commercial attenuated vaccine, which was 100%, and there was no bacterial colonization in spleen, lung, liver and kidney, and there was no significant difference between histopathological observation and blank control. There was no difference between CbpB and SpaA. CbpB recombinant protein has good immunogenicity and protective efficacy, can stimulate the body to produce humoral immunity and cellular immunity, and can be used as a candidate antigen for swine erysipelas genetic engineering subunit vaccine.

Key words: Erysipelothrix rhusiopathiae, CbpB protein, mouse, immunogenicity, immune protection

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