Phenotypic ESBL detectionScreening for ESBL producers was carried out by double disk approximation test and ESBL confirmative test according to CLSI standards. Double disk approximation test was employed by augmentin (20 + 10 µg), cefotaxime and ceftazidime disks, and ESBL confirmation test was tried out by ceftazidime/clavulanate (10 + 30 µg) combination disk and ceftazidime (13, 14). A positive test defined as 5 mm increase in zone diameter in comparison to a disk without clavulanic acid (13, 14). Genus and species of ESBL-producing bacteria were confirmed by Microgen kit and Microgen identification system software (Microgen Bioproducts GNA- ID UK).
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