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Comparison of the vidas clostridium difficile toxin a immunoassay with clostridium difficile culture and cytotoxin and latex tests



Comparison of the vidas clostridium difficile toxin a immunoassay with clostridium difficile culture and cytotoxin and latex tests



Journal of Clinical Microbiology 30(7): 1837-1840



The VIDAS Clostridum difficile toxin A immunoassay (CDA) is a new, automated, enzyme-linked fluorescent-antibody assay for detection of C. difficile toxin A antigen in stool specimens. Stimultaneous, parallel testing was performed by using the VIDAS CDA, the Culturette brand CDT latex test for C. difficle antigens, and conventional laboratory cell culture tests for C. difficile cytotoxity and C. difficle culture. One hundred ninety-four consecutive fresh soft or liquid stool stamples submitted for C. difficile testing between July and September 1990 were evaluated. Of the 194 samples tested, 19 (10%) were from 16 patients who met our case definition for C. difficle-associated disease. The in vitro tests were evaluated in relation to two forms of a clinical case definition. In one form, a positive culture for toxin-producing C. difficile or a positive cytotoxin result obtained directly from the stool specimen was required as laboratory evidence of C. difficile. In the other, a positive result of any of the four laboratory tests was accepted for the laboratory portion of the case definition. No significant difference between the sensitivity of the VIDAS CDA and that of the Culturette brand CDT latex test was found (48 to 58% sensitivity for the CDT latex test and 52 to 63% sensitivity for the VIDAS CDA compared with 93 to 100% sensitivity for culture and 70 to 100% sensitivity for cytotoxin testing). The performance of the VIDAS CDA, however, was hampered by a high percentage of tests (19%) which gave an uninterpretable result.

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