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Hepatitis B virus genotype E surface antigen detection with different immunoassays and diagnostic impact of mutations in the preS/S gene

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Abstract

The major neutralizing epitope, the “a” determinant of the hepatitis B virus (HBV) genotype E surface antigen (HBsAg) is most divergent from that of genotype A, which is used for preparing monoclonal antibodies used in commercially available HBV reagents. To evaluate the performance of the latest generation of HBsAg detection assays with respect to genotype E HBsAg. Three commercial assays were evaluated using sera from 200 Nigerian patients compared to the preS/S sequence of DNA positive samples. Out of 200 samples, 61 and 103 gave concordant positive and negative results between the three HBsAg assays. Of 36 samples with discordant results, 35 were confirmed negative by neutralisation. One of the three assays showed significantly high rate of false positives (29 of 35). DNA positive samples with no detectable HBsAg or reduced HBsAg detection signals (<75% of mean signal obtained with HBsAg positive samples) revealed several mutations (V14A, F46S, N48T, L49R, I49T, D51G, A53V, P54L, Q82P, F83C, L127P, A184V, T189I, S204N, V224A), mostly outside the a-determinant. Several of these mutations are found as wild type nucleotides normally in genotype A and only exceptionally in genotype E. All three assays showed comparable sensitivities for genotype E HBsAg detection (98.4–100%) but differed considerably in specificity (84–99%). Failure to detect HBsAg antigen and differences in signal intensity were mainly associated with mutations in the preS/S gene outside the “a” determinant.

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Authors and Affiliations

  1. Institute of Immunology, National Public Health Laboratory, 20a, rue Auguste Lumière, 1950, Luxembourg, Luxembourg

    Christophe M. Olinger, Wim Ammerlaan & Claude P. Muller

  2. Laboratoires Réunis Junglinster, Z.A.C. Langwies, 6131, Junglinster, Luxembourg

    Bernard Weber & Natascha van der Taelem-Brulé

  3. Institut für Medizinische Virologie, Universitätskliniken Frankfurt, Frankfurt, Germany

    Bernard Weber

  4. Gastrointestinal/Liver Unit, Department of Medicine, University of Ibadan/University College Hospital, Ibadan, Nigeria

    Jesse A. Otegbayo

Authors
  1. Christophe M. Olinger
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  2. Bernard Weber
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  3. Jesse A. Otegbayo
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  4. Wim Ammerlaan
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  5. Natascha van der Taelem-Brulé
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  6. Claude P. Muller
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Correspondence to Bernard Weber.

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Olinger, C.M., Weber, B., Otegbayo, J.A. et al. Hepatitis B virus genotype E surface antigen detection with different immunoassays and diagnostic impact of mutations in the preS/S gene. Med Microbiol Immunol 196, 247–252 (2007). https://doi.org/10.1007/s00430-007-0050-5

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  • DOI: https://doi.org/10.1007/s00430-007-0050-5

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