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DNA colony hybridization with a polynucleotide clonal DNA probe for heat-stable enterotoxin of Vibrio cholerae non-O1 (NAG-ST) was used to screen 197 isolates of V. cholerae O1. Under stringent hybridizing and washing conditions, one strain (GP156) reacted with the probe. The concentrated supernatant from V. cholerae O1 GP156, heated at 100 degrees C for 5 min, elicited fluid accumulation in the suckling mice and that could be completely neutralized by an anti-NAG-ST monoclonal antibody (mAb2F). The preparation from V. cholerae O1 GP156 also inhibited the binding of mAb2F to NAG-ST in a competitive ELISA. V. cholerae O1 GP156 was confirmed to possess a gene encoding cholera toxin (CT). These results indicate that a heat-stable enterotoxin is produced by certain strains of CT-producing V. cholerae O1.
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