Occult hepatitis B in blood donors in Indonesia: altered antigenicity of the hepatitis B virus surface protein

Background and aims Occult hepatitis B virus infection (OBI) poses a challenge to the safety of blood donation. The prevalence of OBI is not well documented in Indonesia, although this information in such an endemic country is needed. This study was aimed to evaluate the prevalence of occult hepatit...

Full description

Saved in:
Bibliographic Details
Published in:Hepatology international 2010-08, Vol.4 (3), p.608-614
Main Authors: Thedja, Meta D., Roni, Martono, Harahap, Alida R., Siregar, Nurjati C., Ie, Susan I., Muljono, David H.
Format: Article
Language:English
Subjects:
Blood & organ donations
Colorectal Surgery
Hepatitis
Hepatology
Medicine
Medicine & Public Health
Mutation
Occult sciences
Original
Original Article
Surgery
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Background and aims Occult hepatitis B virus infection (OBI) poses a challenge to the safety of blood donation. The prevalence of OBI is not well documented in Indonesia, although this information in such an endemic country is needed. This study was aimed to evaluate the prevalence of occult hepatitis B in blood donors from two cities of Indonesia, and to study the genetic variation and its effect on the predicted antigenicity of HBsAg. Methods Serum samples of 309 regular blood donors negative for HBsAg were tested for anti-HBs and anti-HBc. Hepatitis B virus (HBV) DNA isolated from anti-HBc-positive samples were analyzed by polymerase chain reaction, cloned and sequenced. Antigenic properties of identified HBsAg mutants were predicted by calculation of the antigenic index. Results Of the 309 HBsAg-negative samples, anti-HBc was positive in 134 (43.4%) and HBV DNA was detected in 25 (8.1%). Seven of the viremic samples had nucleotide substitutions (A521G, A551T, C582T, and A562G) in the S gene, causing amino acid mutations (T123A, M133L, and T143M) in the ‘ a ’ determinant of HBsAg that resulted in changes in the predicted antigenicity. Conclusions OBI was detected in blood donors’ samples in Indonesia. Anti-HBc was shown to be a better screening parameter than HBsAg, however, it might result in the loss of donors particularly in endemic countries. HBsAg detection failure in this study might be due to mutations altering the protein antigenicity and/or the low-level carriage of HBV.
ISSN:1936-0533
1936-0541
DOI:10.1007/s12072-010-9203-5