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Table 2 Phenotypic tests for detection of E. coli-producing ESBL (n = 246)

From: Cefixime and cefixime-clavulanate for screening and confirmation of extended-spectrum beta-lactamases in Escherichia coli

`   Percentage of positive (%) Percentage of negative (%)
ESBL screening test CTX or CPD or CAZ 81.3 18.7
CTX 81.5 18.5
CPD 80.2 19.8
CAZ 76.5 23.5
CFM 78.9 21.1
Double-disk synergy test CTX or CPD or CAZ 74.8 25.2
CTX 69.9 30.1
CAZ 58.3 41.7
CPD 56.4 43.6
CFM 66.5 33.5
Disk replacement test CTX or CPD or CAZ 79 21
CTX 74.3 25.7
CAZ 65 35
CPD 58.8 41.2
CFM 68.7 31.3
Vitek 2 ESBL test   67.3 32.7