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- W3129123517 abstract "Avian pathogenic Escherichia coli (APEC) O78 and Salmonella typhimurium (S. Typhimurium) are two leading bacterial pathogens that cause significant economic loss in the poultry industry. O-antigen is an important immunogen of these two bacteria to induce host protective immune responses during infection. To develop a bivalent vaccine against APEC O78 and S. Typhimurium, the attenuated Salmonella ST01 (Δasd ΔrfbP Δcrp) was genetically constructed to deliver APEC O78 O-antigen polysaccharide (OPS), which stably expresses OPS with asd+ balanced-lethal system in vitro and in vivo. After oral immunization, the recombinant attenuated Salmonella vaccine (RASV) strain ST01 (pSS26-O78) provided insufficient protection against the APEC O78 challenge. Therefore, the regulated delayed attenuation strain ST02 (Δasd ΔrfbP ΔPcrp::TTaraC PBAD crp) was further constructed by regulating cyclic AMP receptor protein (crp) with araC PBAD cassette to better present the heterologous O-antigen to the host immune system. The innovative recombinant strain ST02 (pSS26-O78) stimulated robust antibody responses against APEC O78 and S. Typhimurium OPS, with serum titers over 1:800 for both IgG and IgA, thereby providing the complement-mediated bactericidal activity and stronger protection against APEC O78 and S. Typhimurium infection. Collectively, this study demonstrates a biologically-conjugated polysaccharide vaccine candidate that can enhance homologous protection against APEC O78 and S. Typhimurium." @default.
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- W3129123517 date "2021-03-01" @default.
- W3129123517 modified "2023-09-24" @default.
- W3129123517 title "Regulated delayed attenuation improves vaccine efficacy in preventing infection from avian pathogenic Escherichia coli O78 and Salmonella typhimurium" @default.
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- W3129123517 doi "https://doi.org/10.1016/j.vetmic.2021.109012" @default.
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