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Vibrio vulnificus causes septicemia and wound infections in immunocompromised humans. The capsular polysaccharide of Vibrio vulnificus (VvPS) is critical for virulence. We synthesized conjugate vaccines of carbotype 1 VvPS under conditions and in formulations suitable for human use. Purified VvPS was conjugated to tetanus toxoid (TT) or to inactivated V. vulnificus cytolysin or elastase by two different schemes. All conjugates elicited elevated anticapsular immunoglobulin G (IgG) and IgM and antiprotein IgG responses in mice compared with saline placebo. The conjugates prepared through caboxyl activation of VvPS (VvPS-TTa, VvPS-cytolysin, and VvPS-elastase) were more immunogenic than the one prepared through hydroxyl activation (VvPS-TTb). The protective efficacy of conjugated and unconjugated formulations of VvPS and that of protein carriers were evaluated in a mouse septicemia model. Eighty percent of mice actively immunized with VvPS-TTa vaccine survived challenge with carbotype 1 V. vulnificus, while VvPS-cytolysin and VvPS-elastase conjugates conferred 44 and 40% protection, respectively. Control mice immunized with VvPS, cytolysin, or elastase alone, or saline only, showed 70 to 100% mortality. VvPS-TTa vaccine is nontoxic, immunogenic, and protective in mice.

infection and immunity

Capsular polysaccharide-protein conjugate vaccines of carbotype 1 Vibrio vulnificus: construction, immunogenicity, and protective efficacy in a murine model