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Double-disc synergy test for screening of extended-spectrum β-lactamase (ESβL). The inhibition zones around the ceftazidime (CAZ), ceftriaxone (CRO), cefotaxime (CTX), and aztreonam (ATM) discs were augmented in the direction of the disc containing clavulanic acid, amoxicillin/clavulanic acid (AMC); this was interpreted as synergy, indicating positive ESβL. This figure appears in color at www.ajtmh.org.
