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Comparison of the sensitivity & specificity of a polyclonal versus monoclonal capture antibody based Bead ELISA for direct detection of cholera toxin from stool specimens.

Authors
  • Ramamurthy, T
  • Bhattacharya, S K
  • Nair, G B
  • Takeda, Y
Type
Published Article
Journal
The Indian Journal of Medical Research
Publisher
Medknow Publications
Publication Date
Jul 01, 1996
Volume
104
Pages
125–128
Identifiers
PMID: 8783514
Source
Medline
License
Unknown

Abstract

This study was conducted to examine whether substitution of polyclonal anti-CT IgG (PAb) coated beads with monoclonal anti-CT IgG, (MAb) coated beads would enhance the sensitivity and specificity of the Bead ELISA for direct detection of CT in stool samples of cholera patients. Sensitivity of MAb Bead ELISA was found to be more efficient (92.7%) than the PAb Bead ELISA (88.2%) in comparison to the 'gold standard' method of conventional culture method (CM). However, the MAb based Bead ELISA had lower specificity (45%) than that of PAb Bead ELISA (51.8%). Further, the positive predictive value was also lower in MAb Bead ELISA (69.9%) as compared to PAb Bead ELISA (82.1%). Generally, all the statistical evaluation demonstrated better agreement between PAb (77.9%) and MAb (72.6%) Bead ELISAs in direct detection of free CT and culture method in confirming the causative organism i.e., Vibrio cholerae in stool specimens. When the two assay systems, viz., PAb and MAb Bead ELISAs were compared, the superiority of the PAb Bead ELISA over MAb Bead ELISA was clearly evident as it had 82.4 per cent of agreement value.

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