Fig. 2

Inhibition zone chart for Klebsiella spp. and E. coli isolates. Zone differences observed between screening and confirmatory tests using each of the screening antibiotics alone and in its appropriate combination with clavulanate for confirmation. CPD cefpodoxime, CTX cefotaxime, CAZ ceftazidime. Region a zone differences for ESBL-positive phenotype. Region b zone-differences for ESBL-negative phenotype. Region (c) unusual zone differences