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Use of flagellin and cholera toxin as adjuvants in intranasal vaccination of mice to enhance protective immune responses against uropathogenic Escherichia coli antigens.
Urinary tract infections (UTIs) caused by Uropathogenic Escherichia coli (UPEC) are among the most common infections in human. Antibiotics are common therapy for UTIs, but increase in antibiotic resistance will complicate future treatment of the infections, making the development of an efficacious UTI vaccine more urgent. In this study, we have evaluated intranasally the efficacy of FliC and FimH antigens of UPEC in different vaccine formulations with and without cholera toxin (CT) adjuvant. Immunization of mice with FliC in fusion form or admixed with FimH elicited higher levels of serum, mucosal and cell-mediated responses than FimH alone. Furthermore, the use of CT in synergism with FliC resulted in the stimulation of a mixed Th1 and Th2 responses against FimH and FliC as antigen and maintained the antibody responses for at least 24 weeks following the last vaccine dose. Of the vaccine preparations, Fusion, Fusion + CT, and FimH admixed with FliC and CT showed the best protection against UPEC. These data indicated that intranasal administration of a FliC and CT adjuvant-based vaccine has the potential to provide protective responses against UPEC strains.
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