Carbapenem-resistant Enterobacteriaceae (CRE) are an urgent public health threat. We evaluated the capacity of the Carba NP test to detect carbapenemase production in 206 isolates: 143 Enterobacteriaceae identified by Oregon's CRE surveillance in 2013 and 63 known carbapenemase-positive organisms. Overall, test sensitivity and specificity were 89% (59/66; 95% CI 81-97%) and 100% (140/140; 95% CI 98-100%), respectively. All KPC, NDM-1, VIM, and IMP-producers but no (0/7) OXA-48-like strains were Carba NP-positive prior to a post-hoc protocol modification. We subsequently incorporated Carba NP into Oregon's CRE screening algorithm.
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