Recovery of carbapenem-resistant Enterobacteriaceae (CRE) from rectal swabs and performance of screening agar plates. Numbers in parentheses show the percentage of the total number of positive samples (n = 33). MacI, MacConkey agar with imipenem (1-μg/ml plates); Chrom, CHROMagar-KPC plates; MacD, MacConkey agar plates with ertapenem, imipenem, and meropenem disks; ND, not detected.