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Antigens present in the extracellular products (ECP) and cell walls of strains of Vibrio anguillarum of serotypes O1, O2, and O3 isolated from different fish species in distinct geographic areas were characterized. The usefulness of slide agglutination, dot blot assay, and quantitative agglutination for subtyping V. anguillarum serovars was also evaluated. The three serological assays used to establish the serogroups within V. anguillarum isolates demonstrated that serotype O1 constitutes a homogeneous group, whereas within serotypes O2 and O3, two different patterns of serological reactions were detected. Among the three serological methods used, only dot blot and quantitative agglutination assays differentiated subgroups within serotypes O2 and O3 with unabsorbed sera. Electrophoretic analysis and immunoblot assays of cell envelope and ECP components showed that strains belonging to serotype O1 possessed immunologically related lipopolysaccharide (LPS) and proteins, while V. anguillarum isolates grouped in serotypes O2 and O3 exhibited internal heterogeneity in their LPS and protein banding patterns. On the other hand, although the LPS present in the ECP and those obtained from cell envelopes of V. anguillarum strains showed apparently different gel patterns, a strong relationship between both types of LPS was seen by immunoblot assay. From these results, it can be concluded that V. anguillarum strains representative of each of the antigenic groups (O1, O2 alpha, O2 beta, O3A, and O3B) and their ECPs should be included in the formulation of vaccines against vibriosis in areas where the three serotypes coexist.

Analysis of antigens present in the extracellular products and cell surface of Vibrio anguillarum serotypes O1, O2, and O3