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Evaluation of two VIDAS ®prototypes for detecting anti-HEV IgG
Florence Abravanel1, Nadège Goutagny2, Corinne Perret2
1CHU Toulouse, Hôpital Purpan, Laboratoire de virologie, National Reference Center for Hepatitis E, F-31300, France; INSERM, U1043, Centre de Physiopathologie de Toulouse Purpan, Toulouse, F-31300, France.
Background:
High performance anti-hepatitis E virus (HEV) IgG assays are crucial for epidemiology.
Objective:
To evaluate the performance of 2 prototypes developed for the VIDAS® automatic system for detecting anti-HEV IgG, one based on the ORF2 antigen (ORF2 prototype) and the other on the ORF2 and ORF3 antigens (ORF2/3 prototype), with reference to the Wantai anti-HEV IgG assay.
Study Design:
The sensitivity of each assay was determined by testing 113 blood samples, 63 from immunocompetent and 50 from immunocompromised patients, with a proven HEV infection defined by detecting HEV RNA. Their specificity was assessed with 103 blood samples that the Wantai assay indicated was negative for anti-HEV IgM and IgG, and negative for HEV-RNA. Cross reactivity was assessed using samples that were positive for hepatitis A virus IgG (n=16), hepatitis C virus antibodies (n=15), hepatitis B virus antigen and anti-HBc antibodies (n=16), rheumatoid factor (n=14), and negative for anti-HEV IgG with the Wantai assay.
Results:
The sensitivities in immunocompetent patients were: 95.2% (ORF2), 96.8% (ORF2/3), and 93.6% (Wantai); in immunocompromised patients they were: 66% (ORF2), 72% (ORF2/3), and 68% (Wantai). Both VIDAS prototypes detected low concentrations of anti-HEV IgG. The overall specificity was 100% (ORF2 prototype) and 98.1% (ORF2/3 prototype). Both VIDAS prototypes cross-reacted in five samples (9.6%), mainly those containing HCV antibodies or rheumatoid factor.
Conclusion:
Both VIDAS® prototypes performed very well and appear to be suitable for routine detection of anti-HEV IgG.
