A New HBsAg Screening Assay Designed for Sensitive Detection of HBsAg Subtypes and Variantsvan Roosmalen M.H. · de Jong J.J. · Haenen W. · Jacobs T. · Couwenberg F. · Ahlers-de Boer G.J.C.M. · Hellings J.A.
BioMérieux BV, Boxtel, The Netherlands
The design of a new HBsAg screening assay, the Hepanostika HBsAg Ultra is based on the use of monoclonal antibodies raised against native wild-type HBsAg and reactive with HBsAg in which the common ‘a’-determinant is modified by site-directed mutagenesis of four of the cysteine moieties. The design was checked using the same cysteine variants and samples from patients known to be infected with HBsAg variants. The results found were compared with other state-of-the-art commercial screening assays. The design of the Hepanostika HBsAg Ultra enabled detection of all variant HBsAg-positive samples in contrast to the other commercial assays. An additional 980 samples were tested to assess the specificity and sensitivity of the Hepanostika HBsAg Ultra. Screening of presumed negative serum and plasma samples resulted in a specificity of 100%. This makes the Hepanostika HBsAg Ultra the first screening assay with a design able to detect HBsAg variants with high sensitivity and specificity.
M.H. van Roosmalen
BioMérieux BV, Boseind 15
NL–5281 RM Boxtel (The Netherlands)
Tel. +31 411 654 503, Fax +31 411 654 311
Received: December 30, 2004
Accepted after revision: March 29, 2005
Number of Print Pages : 6
Number of Figures : 2, Number of Tables : 2, Number of References : 39
Intervirology (International Journal of Basic and Medical Virology)
Vol. 49, No. 3, Year 2006 (Cover Date: January 2006)
Journal Editor: Liebert, U.G. (Leipzig)
ISSN: 0300–5526 (print), 1423–0100 (Online)
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