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Antimicrobial Agents and Chemotherapy, October 2000, p. 2861-2864, Vol. 44, No. 10
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Two Efflux Systems Expressed Simultaneously in Multidrug-Resistant Pseudomonas aeruginosa

Lilian Pumbwe and Laura J. V. Piddock*

Antimicrobial Agents Research Group, Division of Immunity and Infection, University of Birmingham, Birmingham B15 2TT, United Kingdom

Received 13 March 2000/Returned for modification 2 May 2000/Accepted 5 July 2000

Simultaneous overexpression of MexAB-OprM and MexEF-OprN was demonstrated for a multiply antibiotic-resistant clinical isolate of Pseudomonas aeruginosa (G49). G49 also had decreased expression of OprF. No mutations in mexR or its upstream promoter region, mexT, oprM, oprF, or sigX were revealed, suggesting regulation by a hitherto undescribed locus.

* Corresponding author. Mailing address: Antimicrobial Agents Research Group, Division of Immunity and Infection, University of Birmingham, Birmingham B15 2TT, United Kingdom. Phone: 0121-414-6969. Fax: 0121-414-6966. E-mail: l.j.v.piddock{at}bham.ac.uk.

Antimicrobial Agents and Chemotherapy, October 2000, p. 2861-2864, Vol. 44, No. 10
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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