The comparative analysis of the hybridization patterns of DNA restricts for 20 V. cholerae, groups 01 and non-01 (non-0139), containing the incomplete CTX element (ctxAB-) was carried out with the use of probes, complementary to the genes of the proximal part of the virulence cassettle and flanking its RS1 sequences. This group was found to be heterogeneous both in the number of copies of "truncated" CTX prophage and their localizations in the genome, as well as in the position of the sites of restriction endonucleases HindlII and BglII. Among 17 clinically noncholerigenic isolates, 5 etiologically dangerous clones were found, each of them characterized by the definite time and place of isolation. At least one of them proved to be the causative agent of the local outbreak of diarrheal diseases in Uzbekistan.
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