Comparison of Two Enzyme Immunoassay for Detection of Clostridium difficile Toxin A and Toxin B.
10.3343/kjlm.2009.29.2.122
- Author:
Bo Moon SHIN
1
;
Soo Jin YOO
;
Hye Jun OH
Author Information
1. Department of Laboratory Medicine, Sanggye Paik Hospital, Inje University, Seoul, Korea. bmshin@unitel.co.kr
- Publication Type:Original Article ; Comparative Study ; English Abstract
- Keywords:
Clostridium difficile;
Toxin A;
Toxin B;
Enzyme immunoassay;
PCR
- MeSH:
Bacterial Proteins/*analysis/genetics/immunology;
Bacterial Toxins/*analysis/genetics/immunology;
Clostridium difficile/genetics/isolation & purification/*metabolism;
Enterotoxins/*analysis/genetics/immunology;
Enzyme-Linked Immunosorbent Assay/*methods;
Feces/microbiology;
Fluorescent Dyes/chemistry;
Humans;
Reagent Kits, Diagnostic
- From:The Korean Journal of Laboratory Medicine
2009;29(2):122-126
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND: Enzyme immunoassay (EIA) capable of detecting both toxin A and toxin B is strongly recommended for the diagnosis of Clostridium difficile associated disease. Therefore, we evaluated two different EIAs for the detection of C. difficile toxin A/B. METHODS: For a total of 228 stool specimens we performed bacteriologic cultures for C. difficile and examined for toxin A and toxin B using enzyme linked fluorescent immunoassay (ELFA; VIDAS CDAB, Bio-Merieux sa, France) and ELISA (C.DIFFICILE TOX A/B II, TECHLAB, USA). We also performed PCR assays for toxin A and B genes in 117 C. difficile isolates that grew from the stool cultures and compared the results with those obtained with the two different EIAs. RESULTS: The concordance rate between ELFA and ELISA was 85.5% (195/228). Using the culture and PCR results as the standard, the sensitivity/specificity of the ELFA and ELISA were 65.0%/72.1% and 71.8%/70.3%, and for positive/negative predictive values were 78.4%/69.6% and 71.8%/70.3%, respectively (P value >0.05). No differences were observed between the results of ELFA and ELISA with toxin A- toxin B+ strains of C. difficile. CONCLUSIONS: The sensitivity of the ELISA was slightly higher than that of ELFA for toxin A and toxin B, but the specificity and positive predictive value of the ELFA were rather higher than those of the ELISA, although no statistical differences were observed. A bacteriologic culture and PCR assay for toxin genes are recommended in case the both EIAs are negative.
