surface-displayed FomA () protein generally stimulates protective immune responses in mice.

A significant correlation is observed between () and the evolution of inflammatory bowel disease (IBD). Particularly, FomA, a critical pathogenic element of , inflicts substantial detriment to human intestinal health. Our research focused on the development of recombinant that expresses FomA protein, demonstrating its potential in protecting mice from severe IBD induced by . . To commence, two recombinant strains, namely NC8-pSIP409-pgsA'-FomA and NC8-pSIP409-FnBPA-pgsA'-FomA, were successfully developed. Validation of the results was achieved through flow cytometry, ELISA, and MTT assays. It was observed that recombinant instigated mouse-specific humoral immunity and elicited mucosal and T cell-mediated immune responses. Significantly, it amplified the immune reaction of B cells and CD4T cells, facilitated the secretion of cytokines such as IgA, IL4, and IL10, and induced lymphocyte proliferation in response to FomA protein stimulation. Finally, we discovered that administering recombinant could protect mice from severe IBD triggered by , subsequently reducing pathological alterations and inflammatory responses. These empirical findings further the study of an innovative oral recombinant vaccine.