SEROLOGICAL COMPARISON OF 2 COLLECTIONS OF VIBRIO-CHOLERAE NON O1

Two large, independently obtained collections of V. cholerae non-O1, containing 59 and 67 reference strains, respectively, were compared serologically in 4 laboratories. Twenty strains in each collection were considered identical; an additional 16 strains in each collection were probably identical. Twenty-eight unique strains were identified; inconclusive results were obtained with 25 strains. Nine strains were not considered V. cholerae in at least 1 testing laboratory. Of these, 5 showed insufficient correspondence to V. cholerae O1 by DNA hybridization to be considered V. cholerae.