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Table 2 Results of repeat Xpert® C. difficile testing of indeterminate specimens for all specimens, culture-positive specimens, and specimens from patients with severe disease

From: Indeterminate tcdB using a Clostridium difficile PCR assay: a retrospective cohort study

Result Original clinical laboratory result (N (%)) Repeat test (N (%))† Repeat test of culture-positive specimens (N (%)) Repeat test of specimens from patients with severe CDI (N (%))
Negative 0 (0) 23/45 (51) 2/14 (14) 2/7 (29)
Indeterminate* 48 (100) 13/45 (29) 7/14 (50) 2/7 (29)
Positive 0 (0) 9/45 (20) 5/14 (36) 3/7 (43)
  1. * These results were interpreted as negative by the Xpert® assay but had typical amplification curves with a high cycle threshold and low endpoint.
  2. †Three samples did not have sufficient quantity of stool to repeat testing.