Abstract
We report three cases of IMP-type metallo-β-lactamase-producing Enterobacter cloacae bloodstream infection, which showed minimum inhibitory concentration values for imipenem with 2μg/ml in all isolates. Although carbapenems were initiated empirically in all cases, two of three cases died. The Clinical and Laboratory Standards Institute lowered the breakpoints of carbapenems for Enterobacteriaceae in 2010. However, the previous breakpoints are still used in many clinical laboratories, which can result in failure to detect carbapenem-resistant Enterobacteriaceae. Therefore, lower breakpoints of carbapenems should be used in clinical settings, and alternative tests for detecting metallo-β-lactamase such as polymerase chain reaction and immunochromatographic assays may contribute to better detection of carbapenem-resistant isolates.
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