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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
VALIDATION STUDIES
Validation of an indirect ELISA employing a chimeric recombinant gag and env peptide for the serological diagnosis of equine infectious anemia.
Journal of Virological Methods 2018 January
The National Reference Center for equine infectious anemia (EIA) validated a commercial ELISA (Eradikit® EIAV Indirect ELISA, In3diagnostic® , Turin, Italy) employing a chimeric recombinant gag and env peptide for the detection of EIA virus antibodies, following the guidelines of the World Organization for Animal Health. The validation parameters evaluated were: analytical sensitivity (Se) and specificity (Sp); diagnostic Se and Sp; precision, based on repeatability and reproducibility through the estimation of the standard deviation (SD) and the coefficient of variation (CV); accuracy, estimated from a multiple K and relative Sp and Se with respect to those of the agar gel immunodiffusion test (AGIDT). Positive and negative predictive values were also defined. The assay showed a high specificity and a limit of detection of 1.43 log10 major than AGIDT. Diagnostic Se was 100% and Sp was 99.3%, while SD values ranged from 1.58 to 5.01 with a CV between 2.8% and 28.8%. Multiple K was 0.98 and relative Se and Sp were respectively 99.1% and 100%. The assay proved to be robust and to possess a high sensitivity in detecting first antibodies produced at onset of infection as well as high analytic and diagnostic Se and Sp values, confirming it as a serological assay fit for purpose within EIA surveillance programs.
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