Table 1

Stool samples and C. difficile isolates obtained from confirmed CDI cases at six health care institutions in the United States

Institution (by state)CDI diagnosticaNo. of samples obtainedNo. of culture-positive samples (%)No. of nontoxigenic isolates (%)No. of toxigenic isolates (%)
MAGeneXpert125103 (82)0 (0)103 (82)
PAGeneOhm120106 (88)3 (3)103 (86)
MIGDH/TOX EIA +
GeneOhm289261 (90)8 (3)253 (88)
MOC. difficile TOX
A/B II4845 (94)0 (0)45 (94)
ORGDH/TOX EIA +
GeneXpert12098 (82)3 (3)95 (79)
CAGeneXpert150121 (81)0 (0)121 (81)
Total852734 (86)14 (2)720 (85)
  • a CDI diagnostic test performed at each institution prior to shipping of samples: GeneXpert (Cephied, Sunnyvale, CA), GeneOhm (Becton, Dickinson, and Company, Franklin Lakes, NJ), GDH/TOX EIA + (C. Diff Quik Chek Complete; TechLab, Blacksburg, VA), and C. difficile TOX (C. difficile TOX A/B II; TechLab, Blacksburg, VA).