Direct plating of simulated stool specimens on MacConkey agar (MCA) with 10-μg ertapenem, meropenem, and imipenem disks allowed the establishment of optimal zone diameters for the screening of carbapenem-resistant Gram-negative rods (CRGNR) of ≤ 24 mm (ertapenem), ≤ 34 mm (meropenem), and ≤ 32 mm (imipenem).

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3536191PMC
http://dx.doi.org/10.1128/JCM.02878-12DOI Listing

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