TABLE 2.

Results of the boronic acid disk tests for isolates with different β-lactamase contents

Characteristic of strain group (by PCR-confirmed β-lactamase content)No. (%) of isolates positive by the boronic acid testa with:
IPMMERETPFEPCTTFOXCTXCAZ
KPC positive (n = 9)9 (100)9 (100)9 (100)9 (100)9 (100)9 (100)9 (100)9 (100)
KPC/ESBL positive (n = 48)48 (100)48 (100)48 (100)48 (100)48 (100)46 (95.8)29 (60.4)2 (4.2)
Total KPC-possessing isolates (n = 57)57 (100)57 (100)57 (100)57 (100)57 (100)55 (96.5)38 (66.7)11 (19.3)
VIM positive (n = 41)0 (0)0 (0)0 (0)0 (0)2 (4.9)0 (0)0 (0)0 (0)
VIM/ESBL positive (n = 12)0 (0)0 (0)0 (0)0 (0)0 (0)0 (0)0 (0)0 (0)
AmpC positive (n = 9)0 (0)0 (0)0 (0)0 (0)9 (100)8 (88.9)8 (88.9)7 (77.8)
AmpC/ESBL positive (n = 31)0 (0)0 (0)5 (16.1)0 (0)31 (100)24 (77.4)11 (35.5)6 (19.4)
ESBL positive (n = 13)0 (0)0 (0)0 (0)0 (0)0 (0)0 (0)0 (0)0 (0)
Total non-KPC-possessing isolates (n = 106)0 (0)0 (0)5 (4.7)0 (0)42 (39.6)32 (30.2)19 (17.9)13 (12.3)
  • a Abbreviations: IPM, imipenem; MER, meropenem; ETP, ertapenem, FEP, cefepime; CTT, cefotetan; FOX, cefoxitin; CTX, cefotaxime; CAZ, ceftazidime.