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Serological comparison of two collections of Vibrio cholerae non O1

Two large, independently obtained collections of vibrio cholerae non O1, containing 59 and 67 reference strains, respectively, were compared serologically in four laboratories. Twenty strains in each collection were considered identical, and an additional 16 strains in each collection were probably identical. Twenty-eight unique strains were identified, and inconclusive results were obtained with 25 strains. Nine strains were not considered V. cholerae in at least one testing laboratory. Of these, five showed insufficient correspondence to V. cholerae O1 by DNA hybridization to be considered V. cholerae.