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Antimicrobial Agents and Chemotherapy, August 2008, p. 2970-2973, Vol. 52, No. 8
0066-4804/08/$08.00+0     doi:10.1128/AAC.01466-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Postantibiotic Effects and Bactericidal Activities of Levofloxacin and Gatifloxacin at Concentrations Simulating Those of Topical Ophthalmic Administration against Fluoroquinolone-Resistant and Fluoroquinolone-Sensitive Methicillin-Resistant Staphylococcus aureus Strains{triangledown}

Saichi Hoshi,1,2 Ken Kikuchi,1* Takashi Sasaki,1 Chie Sotozono,2 Shigeru Kinoshita,2 and Keiichi Hiramatsu1

Department of Infection Control Science, Faculty of Medicine, Juntendo University, Tokyo 113-8421, Japan,1 Department of Ophthalmology, Kyoto Prefectural University of Medicine, Kyoto 602-0841, Japan2

Received 13 November 2007/ Returned for modification 23 February 2008/ Accepted 9 May 2008

The bactericidal activities and postantibiotic effects (PAEs) of levofloxacin and gatifloxacin at concentrations corresponding to those in antibiotic eye drops against methicillin-resistant Staphylococcus aureus strains were determined. Levofloxacin and gatifloxacin at concentrations simulating those in eye drops showed lower bactericidal activities and shorter PAEs against fluoroquinolone-resistant strains than against fluoroquinolone-sensitive strains.


* Corresponding author. Mailing address: Department of Infection Control Science, Faculty of Medicine, Juntendo University, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan. Phone: 81-3-3813-3111, ext. 3822. Fax: 81-3-3816-2782. E-mail: kikuti{at}med.juntendo.ac.jp

{triangledown} Published ahead of print on 19 May 2008.


Antimicrobial Agents and Chemotherapy, August 2008, p. 2970-2973, Vol. 52, No. 8
0066-4804/08/$08.00+0     doi:10.1128/AAC.01466-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.