Journal Article

Occurrence of integrons and resistance genes among sulphonamide-resistant <i>Shigella</i> spp. from Brazil

Gisele Peirano, Yvonne Agersø, Frank M. Aarestrup and Dalia dos Prazeres Rodrigues

in Journal of Antimicrobial Chemotherapy

Published on behalf of British Society for Antimicrobial Chemotherapy

Volume 55, issue 3, pages 301-305
Published in print March 2005 | ISSN: 0305-7453
Published online March 2005 | e-ISSN: 1460-2091 | DOI:
Occurrence of integrons and resistance genes among sulphonamide-resistant Shigella spp. from Brazil

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  • Medical Oncology
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Objectives: To determine the occurrence of class 1 and 2 integrons and antimicrobial resistance genes among sulphonamide-resistant Shigella strains isolated in Brazil during 1999–2003.

Methods: Sixty-two Shigella (Shigella flexneri, n = 47 and Shigella sonnei, n = 15) were tested against 21 antimicrobial agents. The presence of integrons classes 1 and 2 and antimicrobial resistance genes was investigated by PCR using specific primers.

Results: A total of eight antimicrobial resistance profiles were identified, with the profile of resistance to sulfamethoxazole, trimethoprim, spectinomycin, streptomycin and tetracycline being the most common among S. sonnei, and additionally to ampicillin and chloramphenicol among S. flexneri. Class 1 integrons were found in only two strains, whereas class 2 integrons were found in 56 (90.3%) of the strains. All class 2-positive strains had a similar fragment of 2214 bp harbouring a gene cassette array conferring resistance to trimethoprim, streptothricin and spectinomycin/streptomycin. The genes coding for resistance to chloramphenicol (catA1), tetracycline [tet(A) and tet(B)] and ampicillin (blaOXA and blaTEM), were detected in resistant strains.

Conclusions: The detection of class 1 and 2 integrons and additional antimicrobial resistance genes allowed us to identify the most frequent antimicrobial resistance patterns of Shigella spp. isolated in Brazil.

Keywords: Shigella sonnei; Shigella flexneri; tetracycline; chloramphenicol; OXA and TEM β-lactamases

Journal Article.  3227 words. 

Subjects: Medical Oncology ; Critical Care

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