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

Medicine

Anatomy & Physiology: Current Research

Author(s): Bendall R, Ellis V, Ijaz S, Thurairajah P, Dalton HR

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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. (c) 2007 Wiley-Liss, Inc. This article was published in J Med Virol and referenced in Anatomy & Physiology: Current Research

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