Boston Medical Center Simulation Warns Lower Newborn Vaccination Coverage Could Trigger Tenfold Increase in Hepatitis B Infections

New research from Boston Medical Center shows a tenfold increase in Hep B risk if newborn vaccine coverage drops. Learn why universal birth doses are essential.

By: AXL Media

Published: Apr 28, 2026, 6:07 AM EDT

Source: Information for this report was sourced from EurekAlert

The Critical Interplay of Screening and Newborn Immunization

New simulation modeling from Boston Medical Center (BMC) and the Boston University School of Public Health has illuminated the high stakes of maintaining universal newborn hepatitis B (HBV) vaccination. The study, published in JAMA Pediatrics, examined how variations in vaccination coverage and maternal screening efficacy impact transmission rates across the United States. Researchers found that while prenatal screening is a long-standing recommendation, an estimated 12% to 16% of pregnant individuals in the U.S. remain unscreened. This gap makes the birth-dose vaccination a mechanical necessity to protect infants whose exposure risk is unknown at the time of delivery.

Historical Precedents and the Risks of Reduced Coverage

To understand the potential impact of policy shifts, the research team analyzed historical data from 1999, a period when the birth-dose recommendation was briefly paused. During that interval, vaccination coverage for higher-risk groups dropped to approximately 10%. The BMC model projected that returning to such low coverage levels would result in more than 1,000 additional HBV infections annually. Conversely, under the current universal birth-dose framework where coverage is near 80%, the projected increase in infections is limited to just over 100 cases, representing a tenfold reduction in the risk of viral transmission to newborns.

The Improbability of Offsetting Coverage Gaps with Screening

A central finding of the research is that maternal screening alone is insufficient to replace the protection offered by universal vaccination. According to Margaret Lind, an assistant professor of epidemiology at BU, the model estimated that national screening rates would need to rise to approximately 98% to match the protection levels provided by the current vaccination strategy. Given that such high screening benchmarks have never been achieved in U.S. clinical practice, the researchers argue that reducing vaccination uptake would leave a significant portion of the neonatal population vulnerable to lifelong health complications, including chronic liver disease.