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Updated: Aug 24, 2026

Real-Time Polymerase Chain Reaction-Based Detection and Quantification of Hepatitis B Virus DNA
Published on: December 15, 2023
A phage with high affinity for hepatitis B surface antigen for the detection of HBsAg
Xuanyong Lu1, Paul Weiss, Timothy Block
1Jefferson Center for Biomedical Research and Agricultural Medicine, Department of Biochemistry and Molecular Pharmacology, Thomas Jefferson University, 700 East Butler Avenue, Doylestown, PA 18901, USA. xuanyong.lu@jefferson.edu
Abstract:
An M13 phage, called PHH2, with the ability to bind HBsAg was isolated from a coat protein III display library. The region of the HBsAg polypeptide to which PHH2 binds was determined. The HBsAg binding phage was used in an assay referred to as "PHALISA", an abbreviation for phage-linked immune-absorbent assay. This assay was at least 20-100 times more sensitive in the detection of HBV antigen than conventional enzyme-linked immune-absorbent assays (ELISA). The application of this method for screening and detection of specific protein is discussed.
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