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Antimicrobial Agents and Chemotherapy, November 2007, p. 4163-4166, Vol. 51, No. 11
0066-4804/07/$08.00+0     doi:10.1128/AAC.00156-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Influence of Inoculum Size on the Selection of Resistant Mutants of Escherichia coli in Relation to Mutant Prevention Concentrations of Marbofloxacin{triangledown}

Aude Ferran, Véronique Dupouy, Pierre-Louis Toutain, and Alain Bousquet-Mélou*

UMR181 Physiopathologie et Toxicologie Expérimentales, INRA, ENVT, Ecole Nationale Vétérinaire de Toulouse, 23 chemin des Capelles, BP 87 614, 31076 Toulouse Cedex 3, France

Received 2 February 2007/ Returned for modification 13 June 2007/ Accepted 13 August 2007

We demonstrate using an in vitro pharmacodynamic model that the likelihood of selection of Escherichia coli mutants resistant to a fluoroquinolone was increased when the initial size of the bacterial population, exposed to fluoroquinolone concentrations within the mutant selection window, was increased.

* Corresponding author. Mailing address: UMR181 Physiopathologie et Toxicologie Expérimentales, INRA, ENVT, Ecole Nationale Vétérinaire de Toulouse, 23 chemin des Capelles, BP 87 614, 31076 Toulouse Cedex 3, France. Phone: 33 (0) 5 61 19 39 25. Fax: 33 (0) 5 61 19 39 17. E-mail: a.bousquet-melou{at}envt.fr

{triangledown} Published ahead of print on 20 August 2007.

Antimicrobial Agents and Chemotherapy, November 2007, p. 4163-4166, Vol. 51, No. 11
0066-4804/07/$08.00+0     doi:10.1128/AAC.00156-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.





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