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. 2018 Dec 26;100(3):522–528. doi: 10.4269/ajtmh.18-0396

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Figure 2. — Combination disc test for confirmation of extended-spectrum β-lactamase (ESβL). Ceftazidime (CAZ) disc (30 µg) and combined disc, ceftazidime (CCA)/clavulanate (CCA) (30 µg/10 µg), were placed 20 mm apart. Cefotaxime (CTX) disc (30 µg) and combined disc, cefotaxime (CCT)/CCA (30 µg/10 µg), were placed 20 mm apart. An increase of 5 mm or more in the zone diameter for either antimicrobial agent tested in combination with CCA vs. the zone diameter of the agent when tested alone confirmed the production of ESβL. This figure appears in color at www.ajtmh.org.