TABLE 2.

Summary of results for the combined-disk test and the double-disk synergy test in the detection of MBL-producing gram-negative bacilli

Phenotypic methodNo. of PCR-confirmed MBL-carrying organisms (n = 84)No. of PCR-confirmed non-MBL-carrying organisms (n = 52)Sensitivity (%)Specificity (%)
Combined-disk test84 (100%)1 (2%)10098
Double-disk synergy test66 (79%)1 (2%)7998