1887

Abstract

A total of 133 clinical strains of comprising 44 strains of O1, 45 strains of O139 and 44 strains of non-O1, non-O139 serogroups isolated from hospitalized patients in Kolkata, India, from 1992 to 2000 was examined for the presence of class 1, 2 and 4 integrons. By PCR and DNA sequencing, seven strains of O1, one strain of O139 and six strains of non-O1, non-O139 serogroups were found to contain class 1 integron-harbouring genes , (encoding resistance to streptomycin and spectinomycin), (resistance to -lactams), (resistance to rifampicin), (resistance to kanamycin and gentamicin), and and (resistance to trimethoprim). Most strains produced one or two bands using primers specific for the amplification of the variable region where the antibiotic-resistance genes are located, and their sizes ranged from 700 to 1250 bp. However, one strain of O1 isolated in 1994 gave a 2483 bp fragment, the largest fragment so far found in a class 1 integron of O1. No strain was positive for the gene. All strains, regardless of serogroup, were positive for the gene by PCR and using a colony hybridization test. Amplification of the gene by PCR yielded a 2200 bp fragment (1260 bp larger than the expected size) from three O139 strains isolated in 1999. Sequence analysis of this amplicon revealed an insertion of IS in the middle of the gene. These data indicate that a class 1 integron is present in some clinical strains of isolated in Kolkata, India, and that a class 4 integron is ubiquitously distributed among strains regardless of serogroup.

Keyword(s): CS, conserved segment
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2006-05-01
2019-10-22
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