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Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle
09:35

Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle

Published on: February 1, 2017

Long-term efficacy of immunization against hepatitis B virus in infants at high-risk analyzed by polymerase chain

H Kato1, K Nakata, K Hamasaki

  • 1The First Department of Internal Medicine, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki, Japan.

Vaccine
|November 5, 1999
PubMed

Insights

Hepatitis B virus (HBV) immunization effectively protects high-risk infants from perinatal transmission. Most HBV infections occur within the first year, but vaccination provides protection up to 4-6 years of age.

Area of Science:

  • Immunology
  • Virology
  • Pediatrics

Background:

  • Perinatal transmission of hepatitis B virus (HBV) is a primary cause of chronic infection.
  • Effective immunization strategies are crucial for preventing long-term HBV sequelae in infants.

Purpose of the Study:

  • To evaluate the long-term efficacy of hepatitis B immunization in high-risk infants.
  • To assess the rate of HBV transmission and viral load using polymerase chain reaction (PCR).

Main Methods:

  • A cohort of 251 high-risk infants received hepatitis B immunoglobulin and vaccine between 1981 and 1993.
  • Follow-up assessments included HBV-DNA detection via PCR at 1 year and 4-6 years of age.

Main Results:

  • HBV-DNA was detected in 36% of infants at 1 year.
  • By 4-6 years, the prevalence decreased to 14%, with 2 cases showing breakthrough HBV variants.
  • Most HBV infections were identified within the first year of life.

Conclusions:

  • Infant immunization against HBV is effective in preventing perinatal transmission up to 4-6 years of age.
  • Early detection and intervention are critical, as most infections occur during the first year.

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