Transmission of "a" determinant variants of hepatitis B virus in immunized babies born to HBsAg carrier mothers.

Abstract:

:Hepatitis B virus (HBV) surface antigen mutations may lead to immune escape and eventually cause failure of immunization. In this report, we identified immune escape variants in immunized babies born to hepatitis B surface antigen (HBsAg) carrier mothers. A total of 68 babies were followed up for 2 years after the full course of vaccination; 2.9% (2/68) of babies were found to be infected with the variant HBV in spite of preexisting antibody to surface antigen (anti-HBs) at 24 months post immunization. Both infants were positive for HBV-DNA; sequencing results of the "a" determinant region of the surface gene revealed that both babies had point mutations at a different nucleotide position resulting in various amino acid substitutions. In addition, an intriguing variant having an addition-deletion mutation was observed in one of the babies. This is the first report to show the addition-deletion variant of HBV in India. However, the immunological significance of the above HBV variants needs to be further elucidated.

journal_name

Jpn J Infect Dis

authors

Velu V,Saravanan S,Nandakumar S,Dhevahi E,Shankar EM,Murugavel KG,Kumarasamy T,Thyagarajan SP

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

73-6

issue

1

eissn

1344-6304

issn

1884-2836

journal_volume

61

pub_type

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