Vancomycin-resistant enterococci (VRE) are becoming widespread worldwide, and the rapid identification of VRE carriers from surveillance cultures is crucial for the efficient control of their spread. We assessed a new selective chromogenic medium, chromID VRE (bioMérieux, France), that enhanced the isolation and presumptive identification of VRE directly from rectal swabs and reduced unnecessary confirmatory and timeconsuming tests.Enterococcus species are members of the normal intestinal flora (14), but over the last two decades they have also emerged as important nosocomial pathogens (14,22,23). Since their initial discovery from patients in France and the United Kingdom in 1988 (12, 20), vancomycin-resistant enterococci (VRE) have been reported worldwide (3, 5-7, 9-11, 15, 17). The resistance phenotype VanA is the most common and features high-level resistance to both vancomycin and teicoplanin. Hospital outbreaks of VRE have been reported extensively in the United States (14,22) and in recent years have been increasingly reported in European hospitals, with observed prevalences of 10.4% in the United Kingdom and up to 19.6% in Italy (8,22). The most notable consequences of VRE infection are increases in mortality and the length and cost of hospital stays (2,19,21).Management of a VRE outbreak requires strategies to contain cases and decrease rates of transmission, including isolation of VRE-infected or colonized patients (14, 23). VRE colonization can be monitored by screening cultures of stool or rectal swabs using differential and/or selective media. To date, the widely used medium for VRE screening is bile-esculin azide agar supplemented with 6 g of vancomycin/ml (EVA) (16,23). Although reasonably sensitive, this approach requires additional confirmatory tests to identify isolates and confirm glycopeptide resistance. Alternatively, molecular methods have been developed that allow identification of the glycopeptide resistance genotype (18,23), with the drawbacks that they identify either antimicrobial resistance genes in the absence of a viable organism or resistance determinants carried by an organism other than the targeted bacterium (1).Recent progress in the use of highly specific chromogenic substrates with sufficient sensitivity to identify VRE in a selective agar medium led to the development of chromID VRE (bioMérieux, Marcy l'Etoile, France). The aim of the present study was to evaluate the sensitivity and specificity of this A total of 498 rectal swabs (351 patients) were tested in routine conditions over a 6-week period. Due to a low-level expression of the glycopeptide resistance, the swabs were first incubated for 18 h in a bile broth (AES, Bruz, France) supplemented with 3 g of vancomycin/ml, 5 g of colistin/ml, and 50 g of amphotericin B/ml at 37°C prior to plating on either the conventional BD BBL Enterococcosel vancomycin agar (EVA; BD Diagnostics, Marcy l'Etoile, France) or the chromID VRE medium. Plates were incubated at 37°C under aerobic atmosphere.Colonies on chromID VRE were screene...