Childhood hepatitis B virus infections in the United States before hepatitis B immunization

Area of Science:

• Pediatric Infectious Diseases
• Hepatology
• Public Health Epidemiology

Background:

• Hepatitis B virus (HBV) infection poses a significant threat to child health.
• Pre-immunization eras saw varying infection rates across different demographics.
• Understanding historical HBV incidence is crucial for evaluating vaccination program impact.

Purpose of the Study:

• To quantify the estimated number of hepatitis B virus infections in US children under 10 years old before the widespread adoption of routine childhood immunization.
• To establish a baseline for HBV infection rates in pediatric populations prior to public health interventions.

Main Methods:

• Regression analysis was employed to model HBV infection incidence using existing prevalence data.
• Data from published and unpublished surveys on HBV prevalence in US-born children were utilized.
• Estimated infection rates were applied to 1991 population data, stratified by maternal race, ethnicity, and birthplace, to determine nonperinatal HBV infections.

Main Results:

• Annual HBV infection rates varied significantly, from 24 per 100,000 in non-Asian children to 2,580 per 100,000 in children of Southeast Asian immigrant mothers.
• An estimated 16,000 children under 10 years old were infected annually with HBV in the early 1990s (8,700 non-Asian, 7,300 Asian-American).
• The total estimated nonperinatal infections ranged from 12,000 to 24,900 annually.

Conclusions:

• Thousands of US children acquired HBV infections annually prior to routine infant vaccination.
• These infections placed children at a high risk for developing life-threatening conditions such as cirrhosis and hepatocellular carcinoma later in life.
• The findings underscore the critical public health impact of routine childhood hepatitis B immunization.