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Table 5 Results of boronic acid disk tests using ceftazoidime (CAZ) as substrate with either 300 or 600 μg of APB in the phenotypic detection of Amp C

From: Boronic acid disk diffusion for the phenotypic detection of polymerase chain reaction-confirmed, carbapenem-resistant, gram-negative bacilli isolates

  For screening Test performance
  FOX resistant (n = 31) FOX sensitive (n = 6) Sensitivity Specificity PPV NPV
  +ve by boronic acid -ve by boronic acid +ve by boronic acid -ve by boronic acid
CAZ 300 29 10 0 6 74.36 % 100 % 100 % 37.5 %
CAZ 600 33 6 0 9 84.67 % 100 % 100 % 50 %