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Journal of Clinical Microbiology, June 2005, p. 2994-2995, Vol. 43, No. 6
0095-1137/05/$08.00+0 doi:10.1128/JCM.43.6.2994-2995.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Frequency of Sample Submission for Optimal Utilization of the Cell Culture Cytotoxicity Assay for Detection of Clostridium difficile Toxin
Anita P. Borek,*
Deborah Z. Aird, and
Karen C. Carroll
Division of Microbiology, Department of Pathology, The Johns Hopkins Medical Institutions, Meyer B1-193, 600 N. Wolfe St., Baltimore, Maryland 21287
Received 17 November 2004/
Returned for modification 20 January 2005/
Accepted 16 February 2005
We reviewed the results of repeated sample submissions within a 7-day time frame for Clostridium difficile toxin testing. A total of 2,940 samples were tested during a 3-month period using a cell culture cytotoxicity assay (CCCA). The results from all second samples (n = 1,101) were concordant with the original test result. In only two cases (0.8%; n = 247) was a third sample positive when the first two samples were negative. In this study, submission of multiple samples for CCCA did not increase detection of Clostridium difficile infection.
* Corresponding author. Mailing address: Johns Hopkins Hospital, Meyer Building, Room B1-193, 600 N. Wolfe St., Baltimore, MD 21287-7093. Phone: (410) 955-5077. Fax: (410) 614-8087. E-mail:
aborek1{at}jhmi.edu.
Journal of Clinical Microbiology, June 2005, p. 2994-2995, Vol. 43, No. 6
0095-1137/05/$08.00+0 doi:10.1128/JCM.43.6.2994-2995.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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