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Updated: Jun 3, 2026

Antimicrobial Synergy Testing by the Inkjet Printer-assisted Automated Checkerboard Array and the Manual Time-kill Method
Published on: April 18, 2019
Strain-tailored double-disk synergy test detects extended-spectrum oxacillinases in Pseudomonas aeruginosa
Didier Hocquet1, Barbara Dehecq, Xavier Bertrand
1Service de Bactériologie, Centre National de Référence de la Résistance aux Antibiotiques, Laboratoire Associé Pseudomonas aeruginosa, Centre Hospitalier Universitaire, Besançon, France. dhocquet@univ-fcomte.fr
Abstract:
The prevalence of class D extended-spectrum oxacillinases (ES-OXAs) in ceftazidime-resistant strains of Pseudomonas aeruginosa is often underestimated by double-disk synergy tests (DDST) using clavulanate. A DDST with a customized distance between a disk of ceftazidime or cefepime and inhibitors (clavulanate and imipenem) detected 14 out of 15 different ES-OXAs.

