Evaluation of Methods for Detection of Clostridium difficile and its
Toxins in Patients with Nosocomial Diarrhoea
Abstract:
The aim of this study was to compare stool cytotoxin assay as the standard
test with enzyme immunoassay system (C. difficile Tox A/B Tech Lab) and C.
difficile bacterial culture on cycloserine-cefoxitin fructose agar followed
by cytotoxin assay (toxigenic culture). A total of 650 stool specimens from
hospitalized patients with nosocomial diarrhoea were collected from December
2002 to February 2004. C. difficile was detected by culture method in 146
samples. Of these samples 103 isolates were toxigenic by toxigenic culture. One
hundred twelve and 108 stool specimens were positive for C. difficile
toxins by enzyme immunoassay (Tox A/B immunoassay) and stool cytotoxin assay,
respectively. Ninety eight samples were diagnosed to be positive in all test
methods. Toxigenic C. difficile was isolated from 2 stool cytotoxin assay
and 3 enzyme immunoassay negative stools. Sensitivity and specificity for Tox
A/B immunoassay in relation to the stool cytotoxin assay was 95.6% (95% CI) and
98.3% (95% CI), respectively. The results of the present study showed that
sensitivity and specificity Tox A/B immunoassay was very close with stool
cytotoxin assay.
How to cite this article
N. Sadeghifard, M. H. Salari, M.R. Ghasemi and F. Amin-Harati, 2005. Evaluation of Methods for Detection of Clostridium difficile and its
Toxins in Patients with Nosocomial Diarrhoea. Pakistan Journal of Biological Sciences, 8: 1256-1260.
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