Over the course of seven pandemics, Vibrio cholerae serotypes have varied. In 1992 the appearance of a new serotype, O139 Bengal, began the eighth cholera pandemic. Several new O139 antigens have been identified, yet a common V. cholerae antigen has not been described. In this study, a monoclonal antibody specific against an 18.7-kDa outer membrane antigen reacted in dotblot analysis with 292 epidemiologically diverse V. cholerae isolates including O1, non-O1, and O139 serotypes. Serum collected from volunteers experimentally challenged with V. cholerae O139, and rabbit antisera to V. cholerae O1, were reactive with the 18.7-kDa antigen by Western immunoblot. This is the first report that the 18.7-kDa antigen is present in V. cholerae O139.
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