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A longitudinal follow-up of asymptomatic hepatitis B surface antigen-positive Chinese children
Insights
Chronic hepatitis B virus infection in asymptomatic Chinese children typically shows mild liver disease and stable health, despite high viral replication. Early exposure may induce immune tolerance, leading to persistent high hepatitis B virus DNA levels.
Area of Science:
- Hepatology
- Virology
- Pediatrics
Background:
- Chronic hepatitis B virus (HBV) infection is a global health concern.
- Understanding the early natural history of HBV in children is crucial for management.
- Asymptomatic carriers represent a significant reservoir for HBV transmission.
Purpose of the Study:
- To investigate the clinical, biochemical, and virological evolution of chronic hepatitis B in asymptomatic Chinese children.
- To assess the natural course of hepatitis B virus infection during the early phase.
- To explore potential mechanisms underlying disease stability despite high viral load.
Main Methods:
- Prospective follow-up of 51 asymptomatic Chinese children with hepatitis B surface antigen (HBsAg) positivity.
- Monitoring clinical examinations, serum alanine aminotransferase (ALT) levels, and hepatitis B virus DNA.
- Assessing hepatitis B e antigen (HBeAg) and antibody to HBeAg (anti-HBe) status over time.
Main Results:
- Hepatomegaly was the only common abnormal clinical finding.
- 80% of children had normal ALT levels at presentation, with 60% remaining normal throughout the study.
- High levels of hepatitis B virus replication were observed, with 84% HBeAg positive at baseline.
- HBeAg clearance was rare (7%), and all children remained HBsAg positive.
Conclusions:
- Asymptomatic chronic HBV infection in Chinese children is generally associated with mild, stable liver disease.
- High HBV replication may persist due to immunological tolerance induced by early-life exposure.
- The findings suggest a unique disease profile in this pediatric population.
Abstract:
Fifty-one asymptomatic Chinese hepatitis B surface antigen (HBsAg) carrier children (34 boys, 17 girls), age 1 to 15 years (median: 10 years), were prospectively followed for up to 4 years (median: 30 months) to determine the natural evolution of clinical, biochemical and virological features during the early phase of chronic hepatitis B virus infection. Hepatomegaly was the only abnormal finding on examination, being present in five children initially and four at follow-up. Serum ALT levels were normal in 80% of the children at presentation and remained within the normal range during the study in 60%. Fluctuations in ALT levels were mild. In four of 12 instances, transient elevations in ALT levels were associated with a fall in serum hepatitis B virus DNA levels. At presentation, 43 (84%) children were hepatitis B e antigen (HBeAg) positive; only two (7%) cleared HBeAg on follow-up. None of the eight children who were initially positive for the antibody to HBeAg reverted back to HBeAg positivity. All the children remained HBsAg positive. In this study, we demonstrated that chronic hepatitis B virus infection in asymptomatic Chinese children is usually associated with a mild and stable liver disease despite high levels of hepatitis B virus replication. This may reflect an immunological tolerance to the hepatitis B virus induced by early exposure to the virus and accounts for the persistently high levels of hepatitis B virus replication on follow-up.