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Journal of Clinical Microbiology, November 2006, p. 4204-4207, Vol. 44, No. 11
0095-1137/06/$08.00+0     doi:10.1128/JCM.00918-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

First Detection of the Ambler Class C 1 AmpC ß-Lactamase in Citrobacter freundii by a New, Simple Double-Disk Synergy Test{triangledown}

Etienne Ruppé,1 Philippe Bidet,1 Charlotte Verdet,2 Guillaume Arlet,2 and Edouard Bingen1*

Université Paris VII, UFR Médicale; EA 3105, Laboratoire d'Études de Génétique Bactérienne dans les Infections de l'Enfant; and Assistance Publique-Hôpitaux de Paris, Service de Microbiologie, Hôpital Robert Debré, Paris, France,1 Université Paris VI, Faculté de Médecine Pierre et Marie Curie, and UPRES EA 2392, Laboratoire de Bactériologie, Paris, France2

Received 2 May 2006/ Returned for modification 12 June 2006/ Accepted 29 August 2006

We report on the first detection of an AmpC-type Ambler class C 1 (ACC-1) ß-lactamase in Citrobacter freundi isolated from a patient also harboring ACC-1-producing Escherichia coli and Klebsiella pneumoniae. We propose a simple cefoxitin-based double-disk synergy test (DDST) for the specific detection of ACC-1 in members of the family Enterobacteriaceae, including natural AmpC producers, in association with a cloxacillin-based DDST as a first-line AmpC-type ß-lactamase screening test.

* Corresponding author. Mailing address: Service de Microbiologie, Hôpital Robert Debré, 48 Bd. Sérurier, 75395 Paris cedex 19, France. Phone: 33 1 40 03 23 40. Fax: 33 1 40 03 24 50. E-mail: edouard.bingen{at}rdb.ap-hop-paris.fr.

{triangledown} Published ahead of print on 13 September 2006.

Journal of Clinical Microbiology, November 2006, p. 4204-4207, Vol. 44, No. 11
0095-1137/06/$08.00+0     doi:10.1128/JCM.00918-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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