NDLI: Impact of Clinical Symptoms on Interpretation of Diagnostic Assays for Clostridium difficile Infections ▿

Content Provider	PubMed Central
Author	Dubberke, Erik R. Han, Zhuolin Bobo, Linda Hink, Tiffany Lawrence, Brenda Copper, Susan Joan, Hoppe-bauer Burnham, Carey-ann D. Dunne, William Michael
Copyright Year	2011
Abstract	Asymptomatic Clostridium difficile colonization is common in hospitalized patients. Existing C. difficile assay comparisons lack data on severity of diarrhea or patient outcomes, limiting the ability to interpret their results in regard to the diagnosis of C. difficile infection (CDI). The objective of this study was to measure how including patient presentation with the C. difficile assay result impacted assay performance to diagnose CDI. Stool specimens from 150 patients that met inclusion and exclusion criteria were selected. Nine methods to detect C. difficile in stool were evaluated. All patients were interviewed prospectively to assess diarrhea severity. We then assessed how different reference standards, with and without the inclusion of patient presentation, impact the sensitivity, specificity, and positive and negative predictive values of the assays to diagnose CDI. There were minimal changes in sensitivity; however, specificity was significantly lower for the assays Tox A/B II, C. diff Chek-60, BD GeneOhm Cdiff, Xpert C. difficile, and Illumigene C. difficile and for toxigenic culture (P was <0.01 for all except Tox A/B II from fresh stool, for which the P value was 0.016) when the reference standard was recovery of toxigenic C. difficile from stool plus the presence of clinically significant diarrhea compared to when the reference standard was having at least four assays positive while ignoring diarrhea severity. There were 15 patients whose assay result was reported as negative but subsequently found to be positive by at least four assays in the comparison. None suffered from any CDI-related adverse events. In conclusion, clinical presentation is important when interpreting C. difficile diagnostic assays.
Related Links	http://dx.doi.org/10.1128/JCM.00891-11
Starting Page	2887
File Format	PDF
ISSN	1098660X
e-ISSN	1098660X
Journal	Journal of Clinical Microbiology
Issue Number	8
Volume Number	49
Language	English
Publisher	American Society for Microbiology
Publisher Date	2011-08-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Microbiology (medical)

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