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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.