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Antimicrobial Agents and Chemotherapy, March 2004, p. 753-757, Vol. 48, No. 3
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.3.753-757.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

In Vitro Double and Triple Synergistic Activities of Polymyxin B, Imipenem, and Rifampin against Multidrug-Resistant Acinetobacter baumannii

Jimmy Yoon,1 Carl Urban,1,2* Christian Terzian,1 Noriel Mariano,1 and James J. Rahal1,3

Infectious Disease Section, New York Hospital Queens, Flushing,1 Departments of Microbiology,2 Medicine, Weill Medical College of Cornell University, New York, New York3

Received 17 June 2003/ Returned for modification 12 September 2003/ Accepted 12 November 2003

Eight unrelated clinical Acinetobacter baumannii isolates resistant to all commonly used antibiotics were subjected to three-dimensional checkerboard microtiter plate dilution and time-kill studies at one-fourth of their MICs of polymyxin B, imipenem, and rifampin. Synergy was demonstrated with combinations of polymyxin B and imipenem, polymyxin B and rifampin, and polymyxin B, imipenem, and rifampin. Double combinations of polymyxin B and imipenem and of polymyxin B and rifampin were bactericidal for seven of eight isolates, and triple combinations were bactericidal for all isolates within 24 h. Future clinical studies using double and triple therapy with these antibacterials may provide an effective option against potentially lethal infection due to multiresistant Acinetobacter baumannii.

* Corresponding author. Mailing address: New York Hospital Queens, 56-45 Main St., Flushing, NY 11355. Phone: (718) 670-1525. Fax: (718) 661-7899. E-mail: cmurban{at}nyp.org.

Antimicrobial Agents and Chemotherapy, March 2004, p. 753-757, Vol. 48, No. 3
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.3.753-757.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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