ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (3): 588-596.doi: 10.11843/j.issn.0366-6964.2018.03.016

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Immune Efficacy of Transferrin-binding Protein A of Haemophilus parasuis in Piglets

YAO Yan-bin, CHEN Zhang, CHU Xia-fei, WEI Jian-zhong, SUN Pei, LI Yu*   

  1. College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
  • Received:2017-09-19 Online:2018-03-23 Published:2018-03-23

Abstract:

The aim of this study was to investigate the immune efficacy of the transferrin-binding protein A of HPS and to lay a foundation for research and development of new vaccine. The piglets were immunized with the inactivated whole cell vaccine from HPS serotype 13 and recombinant protein TbpA(0.5 and 0.25 mg·4 mL-1). The immunization was conducted at week 0, 2, 4 and then challenged with HPSLJ3 (7 LD50). Serum antibody (IgG) and cytokines (IL-5, IL-10, IFN-γ, TNF-α) levels were measured by ELISA and pathological examination was performed. Results were as follows:Immunization and challenge assay demonstrated the recombinant protein TbpA could induce high levels of antibody (IgG) and cytokines. The protective efficacy of the inactivated whole cell and TbpA (0.5 mg·4mL-1) vaccines was 100%. There was a significant difference between the pathological changes and the control group. TbpA can stimulate the humoral and cellular immunity, and produce powerful immune protection. These results suggested that TbpA is a potential candidate for developing a novel HPS vaccine.

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