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BMC Infect Dis. 2010 Apr 28;10:103. doi: 10.1186/1471-2334-10-103.

Cellular immunity in children with successful immunoprophylactic treatment for mother-to-child transmission of hepatitis B virus.

Author information

1
Department of Pediatrics, Yokohama Eastern Hospital, 3-6-1 Shimosueyoshi Tsurumi Yokohama, Kanagawa 230-0012, Japan. haruki-komatsu@chive.ocn.ne.jp

Abstract

BACKGROUND:

The administration of hepatitis B immunoglobulin followed by hepatitis B vaccine can result in a protective efficacy of almost 90% in mother-to-child transmission of hepatitis B virus (HBV). However, little is known about immunity against HBV infection in children after immunoprophylactic treatment. We tried to assess the association between T-cell responses and viremia in children after successful prophylactic treatment.

METHODS:

Thirteen children and their 8 HBV carrier mothers (8 families), who were positive for human leukocyte antigen (HLA)-A24, were enrolled in this study. All of the 13 children received immunoprophylactic treatment and became negative for hepatitis B surface antigen (HBsAg) after birth. HBV-specific cytotoxic T lymphocyte (CTL) responses were evaluated using IFNgamma - enzyme-linked immunosorbent spot (ELISPOT) and major histocompatibility complex class I peptide pentamer assays. Serum HBV DNA was measured by real-time PCR.

RESULTS:

Significant HBV-specific T-cell responses were detected in 2 (15%) of the 13 children by ELISPOT. However, the frequency of HLA-A24-HBV-specific CTLs was very low in both HBV carrier mothers and children using pentamers. Of the 13 children, 4 (31%) were positive for serum HBV DNA. However, the levels of serum HBV DNA were 100 copies/ml or less. One of the 2 children in whom significant HBV-specific CTL responses were detectable was positive for serum HBV DNA.

CONCLUSIONS:

HBV core and polymerase-specific T-cell responses were detected and a low-dose viremia was observed in children after successful immunoprophylaxis treatment. Although the presence of viremia was not related to HBV-specific T-cell responses, CTLs might play a role in the control of HBV infection in children born to HBsAg-positive mothers after immunoprophylactic treatment.

PMID:
20423521
PMCID:
PMC2879245
DOI:
10.1186/1471-2334-10-103
[Indexed for MEDLINE]
Free PMC Article
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