Plasmid mediated quinolone resistance determinants qnr, aac(6′)-Ib-cr, and qep in ESBL-producing Escherichia coli clinical isolates from Egypt.
Indian J Med Microbiol
;
2012 Oct-Dec; 30(4): 442-447
Artigo
em Inglês
| IMSEAR
| ID: sea-144007
ABSTRACT
Purpose:
To characterize the prevalence of plasmid-mediated quinolone resistance determinants qnr, aac(6′)-Ib-cr and qep in extended-spectrum β-lactamase (ESBL) -producing E. coli and to determine the association of these determinants with CTX-M group in Cairo, Egypt. Materials andMethods:
MICs of 15 antimicrobial agents against 70 E. coli clinical isolates were determined using agar dilution technique according to CLSI. Screening for the qnrA, qnrB, qnrS, aac(6′)-Ib, qep and CTX-M genes was carried out by PCR amplification and DNA sequencing. Curing was used to confirm whether qnr, aac(6′)-Ib, qep or ESBL-encoding genes were located on plasmids.Results:
Out of 70 E. coli clinical isolates, 61 were resistant to at least one antibiotic, 16 (22.8%) were multidrug resistant and 30 (42%) were ESBL producers. Out of 30 ESBL producers E. coli isolates, 8 (26.6%) were positive for qnr genes, and the qnrA1-, qnrB1-and qnrS1-type genes were detected alone or in combination in 5 (16.6%), 7 (23.3%) and 5 (16.6%) isolates, respectively. Seven (23.3%) isolates were positive for aac(6′)-Ib-cr and only two (6.6%) isolates were positive for qepA4. Loss of all plasmids upon curing suggested that qnr, aac(6′)-Ib-cr , qep A4 and ESBL-encoding genes were always plasmid mediated. Out of 8 Qnr positive isolates 5 were associated with both CTX-M-1 and CTX-M-9 while 2 from 6 aac(6′)-Ib-cr positive isolates were associated with both CTX-M-1 and CTX-M-9.Conclusions:
This study highlights the prevalence of quinolone resistance determinants qnr, aac(6′)-Ib-cr , qep A4 associated with CTX-M positive E. coli isolates from Egypt. This is the first report of the plasmid mediated fluoroquinolone efflux pump, Qep A from Egypt.
Texto completo:
DisponíveL
Índice:
IMSEAR (Sudeste Asiático)
Assunto principal:
Plasmídeos
/
Beta-Lactamases
/
Humanos
/
DNA Bacteriano
/
Testes de Sensibilidade Microbiana
/
Farmacorresistência Bacteriana
/
Egito
/
Escherichia coli
/
Infecções por Escherichia coli
/
Antibacterianos
País/Região como assunto:
África
Idioma:
Inglês
Revista:
Indian J Med Microbiol
Assunto da revista:
Microbiology
Ano de publicação:
2012
Tipo de documento:
Artigo
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