Indian Journal of Medical Microbiology IAMM  | About us |  Subscription |  e-Alerts  | Feedback |  Login   
  Print this page Email this page   Small font sizeDefault font sizeIncrease font size
 Home | Ahead of Print | Current Issue | Archives | Search | Instructions  
Users Online: 2289 Official Publication of Indian Association of Medical Microbiologists 
 ~   Next article
 ~   Previous article
 ~   Table of Contents

 ~   Similar in PUBMED
 ~  Search Pubmed for
 ~  Search in Google Scholar for
 ~Related articles
 ~   Citation Manager
 ~   Access Statistics
 ~   Reader Comments
 ~   Email Alert *
 ~   Add to My List *
 * Requires registration (Free)
 

 Article Access Statistics
    Viewed4584    
    Printed162    
    Emailed6    
    PDF Downloaded139    
    Comments [Add]    
    Cited by others 4    

Recommend this journal

 

 ORIGINAL ARTICLE
Year : 2012  |  Volume : 30  |  Issue : 4  |  Page : 442-447

Plasmid mediated quinolone resistance determinants qnr, aac(6′)-Ib-cr, and qep in ESBL-producing Escherichia coli clinical isolates from Egypt


1 Department of Microbiology and Immunology, Faculty of Pharmacy, Helwan University, Egypt
2 Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Egypt

Correspondence Address:
RAA Domany
Department of Microbiology and Immunology, Faculty of Pharmacy, Helwan University
Egypt
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0255-0857.103766

Rights and Permissions

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 and Methods: 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.






[FULL TEXT] [PDF]*


        
Print this article     Email this article

2004 - Indian Journal of Medical Microbiology
Published by Wolters Kluwer - Medknow

Online since April 2001, new site since 1st August '04