Effect of Antibiotic Therapy on the Density of Vancomycin-Resistant Enterococci in the Stool of Colonized Patients
Curtis J. Donskey, M.D., Tanvir K. Chowdhry, M.D., Michelle T. Hecker, M.D., Claudia K. Hoyen, M.D., Jennifer A. Hanrahan, D.O., Andrea M. Hujer, B.S., Rebecca A. Hutton-Thomas, B.S., Christopher C. Whalen, M.D., Robert A. Bonomo, M.D., and Louis B. Rice, M.D.
Background Colonization and infection with vancomycin-resistantenterococci have been associated with exposure to antibioticsthat are active against anaerobes. In mice that have intestinalcolonization with vancomycin-resistant enterococci, these agentspromote high-density colonization, whereas antibiotics withminimal antianaerobic activity do not.
Methods We conducted a seven-month prospective study of 51 patientswho were colonized with vancomycin-resistant enterococci, asevidenced by the presence of the bacteria in stool. We examinedthe density of vancomycin-resistant enterococci in stool duringand after therapy with antibiotic regimens and compared theeffect on this density of antianaerobic agents and agents withminimal antianaerobic activity. In a subgroup of 10 patients,cultures of environmental specimens (e.g., from bedding andclothing) were obtained.
Results During treatment with 40 of 42 antianaerobic-antibioticregimens (95 percent), high-density colonization with vancomycin-resistantenterococci was maintained (mean [±SD] number of organisms,7.8± 1.5 log per gram of stool). The density of colonizationdecreased after these regimens were discontinued. Among patientswho had not received antianaerobic antibiotics for at leastone week, 10 of 13 patients who began such regimens had an increasein the number of organisms of more than 1.0 log per gram (meanincrease, 2.2 log per gram), whereas among 10 patients who beganregimens of antibiotics with minimal antianaerobic activity,there was a mean decrease in the number of enterococci of 0.6log per gram (P= 0.006 for the difference between groups). Whenthe density of vancomycin-resistant enterococci in stool wasat least 4 log per gram, 10 of 12 sets of cultures of environmentalspecimens had at least one positive sample, as compared with1 of 9 sets from patients with a mean number of organisms instool of less than 4 log per gram (P=0.002).
Conclusions For patients with vancomycin-resistant enterococciin stool, treatment with antianaerobic antibiotics promoteshigh-density colonization. Limiting the use of such agents inthese patients may help decrease the spread of vancomycin-resistantenterococci.
Source Information
From the Infectious Diseases Section (C.J.D., A.M.H., R.A.H.-T., R.A.B.) and the Medical Service (L.B.R.), Louis Stokes Cleveland Veterans Affairs Medical Center; the Division of Infectious Diseases (T.K.C.) and the Department of Epidemiology (C.C.W.), Case Western Reserve University; the Division of Infectious Diseases, MetroHealth Medical Center (M.T.H., J.A.H.); and the Division of Pediatric Infectious Diseases, Rainbow Babies and Children's Hospital (C.K.H.) all in Cleveland.
Address reprint requests to Dr. Donskey at the Louis Stokes Cleveland Veterans Affairs Medical Center, Infectious Diseases Section 1110 (W), 10701 East Blvd., Cleveland, OH 44106, or at curtisd123{at}yahoo.com.
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