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The results of prevalence studies on glycopeptide-resistant enterococci (GRE) in the intestine may be influenced by the detection methods applied. In most studies different media, different concentrations of antibiotics, and different methods are used, and these differences result in differences in recovery rates. In this cross-sectional study on the carrier state of GRE among patients at the University Hospital Antwerp, Antwerp, Belgium, performed on 21 May 1996, direct plating and broth enrichment were compared by using the same media. Stool samples (n = 213) or rectal swabs (n = 122) were plated directly on Enterococcosel agar (bioMérieux) and after enrichment in Enterococcosel broth. The prevalence of GRE was 12.8%. Direct plating recovered 53.4% of the GRE isolates, and broth enrichment recovered an additional 46.5% of them; in the latter test the isolates were thus present at less than 103 CFU per g of feces. The prevalence of GRE among dialysis patients was higher than among the other patients, but the difference was not significant (P = 0.06), possibly as a result of the small numbers of dialysis patients examined. The GRE species isolated included 19E. gallinarum (44.2%), 13E. faecium (30.2%), 6E. faecalis (13.9%), and 5E. casseliflavus (11.6%) isolates. AllE. faecalis andE. faecium strains isolated carried thevanA gene, andE. gallinarum andE. casseliflavus carried thevanC1 andvanC2 gene, respectively. The majority of isolates were polyclonal. Our data indicate that the rate of detection of GRE from both stool samples and rectal swabs is significantly increased with enrichment cultures.

journal of clinical microbiology

Comparison of Direct Plating and Broth Enrichment Culture for the Detection of Intestinal Colonization by Glycopeptide-Resistant Enterococci among Hospitalized Patients