Document Detail

Molecular analysis of hepatitis B virus associated with vaccine failure in infants and mothers: A case-control study in Thailand.
MedLine Citation:
PMID:  22711345     Owner:  NLM     Status:  In-Data-Review    
Perinatal transmission of hepatitis B virus (HBV) has been controlled incompletely despite adequate immunoprophylaxis in infants. The aim of this study was to characterize virological factors of HBV associated with vaccine failure in Thailand. Sera of 14 infected infants (13 HBeAg-positive and one HBeAg-negative) with vaccine failure and their respective mothers (group M1) were tested quantitatively for HBV DNA by real-time PCR, HBV genotypes and mutations were characterized by direct sequencing. Sera collected from 15 HBeAg-positive (group M2) and 15 HBeAg-negative (group M3) mothers whose infants had been vaccinated successfully served as controls. The results showed that group M1 and group M2 mothers had equal titers of HBV DNA but higher titers than group M3. All infected infants and their respective mothers had the same HBeAg status and HBV genotypes. DNA analysis in a pair of HBeAg-negative infant and mother revealed that both were infected with an HBV precore mutant (G1896A). Escape mutants in the "a" determinant region (residues 144 and 145) were detected in two (14%) infected infants. The prevalence of BCP mutations/deletions in groups M2 and M3 was higher significantly than in group M1 (P = 0.022 and P < 0.001, respectively). In conclusion, instead of the HBeAg status, a high titer of HBV DNA in mothers was the major contributor to perinatal transmission of HBV. Escape mutants might be associated with vaccine failure in some infants. BCP mutations/deletions in mothers might contribute to the prevention of mother-to-infant transmission of HBV. J. Med. Virol. 84: 1177-1185, 2012. © 2012 Wiley Periodicals, Inc.
Pattaratida Sa-Nguanmoo; Pisit Tangkijvanich; Piyanit Tharmaphornpilas; Aim-Orn Rasdjarmrearnsook; Saowanee Plianpanich; Nutchanart Thawornsuk; Apiradee Theamboonlers; Yong Poovorawan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of medical virology     Volume:  84     ISSN:  1096-9071     ISO Abbreviation:  J. Med. Virol.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-06-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7705876     Medline TA:  J Med Virol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1177-85     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
Center of Excellence in Clinical Virology, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
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