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Appl. Environ. Microbiol., Aug 1995, 2898-2904, Vol 61, No. 8
IG Rivera, MA Chowdhury, A Huq, D Jacobs, MT Martins and RR Colwell
Enterobacterial repetitive intergenic consensus (ERIC) sequence
polymorphism was studied in Vibrio Cholerae strains isolated before and
after the cholera epidemic in Brazil (in 1991), along with epidemic strains
from Peru, Mexico, and India, by PCR. A total of 17 fingerprint patterns
(FPs) were detected in the V. cholerae strains examined; 96.7% of the
toxigenic V. cholerae O1 strains and 100% of the O139 serogroup strains
were found to belong to the same FP group comprising four fragments (FP1).
The nontoxigenic V. cholerae O1 also yielded four fragments but constituted
a different FP group (FP2). A total of 15 different patterns were observed
among the V. cholerae non-O1 strains. Two patterns were observed most
frequently for V. cholerae non-01 strains, 25% of which have FP3, with five
fragments, and 16.7% of which have FP4, with two fragments. Three
fragments, 1.75, 0.79, and 0.5 kb, were found to be common to both
toxigenic and nontoxigenic V. cholerae O1 strains as well as to group FP3,
containing V. cholerae non-O1 strains. Two fragments of group FP3, 1.3 and
1.0 kb, were present in FP1 and FP2 respectively. The 0.5-kb fragment was
common to all strains and serogroups of V. cholerae analyzed. It is
concluded from the results of this study, based on DNA FPs of environmental
isolates, that it is possible to detect an emerging virulent strain in a
cholera- endemic region. ERIC-PCR constitutes a powerful tool for
determination of the virulence potential of V. cholerae O1 strains isolated
in surveillance programs and for molecular epidemiological investigations.
Copyright © 1995, American Society for Microbiology
Enterobacterial repetitive intergenic consensus sequences and the PCR to generate fingerprints of genomic DNAs from Vibrio cholerae O1, O139, and non-O1 strains
Department of Microbiology, University of Maryland, College Park, USA.
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