A time-series prospective study of patients admitted to the hospital for treatment of community-acquired pneumonia was undertaken to determine vancomycin-resistant enterococcal perianal colonization rates among patients who received ceftriaxone with or without erythromycin versus those who received levofloxacin. A colonization rate of 16% (8/51) was found in the ceftriaxone-erythromycin group versus 0% (0/52) in the levofloxacin group .
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