Serological response to hepatitis E virus genotype 3 infection: IgG quantitation, avidity, and IgM response

R. Bendall*, V. Ellis, Samreen Ijaz, P. Thurairajah, H. R. Dalton

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    75 Citations (Scopus)

    Abstract

    Sequential sera were collected from 18 acute cases of UK-acquired hepatitis E. The virus strains in all cases were of genotype 3. The IgM and IgG response to acute infection were documented over time using EIA kits based on a peptide antigen, pE2, which is derived from a genotype 1 strain of hepatitis E virus (HEV). Ninety-five percentage of acute sera were IgM positive; after 6 months or more only 12% remained positive. The kit was adapted to quantify the IgG response (in WHO U/ml) and to determine antibody avidity. Following acute infection, anti-HEV IgG concentrations rose between 6.9- and 90-fold. IgG avidity was low (<25%) in most acute sera. After 6 months IgG avidity was greater than 50% in all cases. One patient with a poor IgM response and high avidity antibody in acute sera may have had a second HEV infection. Taken together, these results confirm that the pE2-based EIA kits are suitable for diagnosing acute HEV genotype 3 infection. With simple modifications the IgG kit can measure anti-HEV concentration and avidity, which can be used to confirm acute infection.

    Original languageEnglish
    Pages (from-to)95-101
    Number of pages7
    JournalJournal of Medical Virology
    Volume80
    Issue number1
    DOIs
    Publication statusPublished - Jan 2008

    Keywords

    • Hepevirus
    • HEV
    • pE2
    • Serology

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