A new study finds that more than half of young children exposed to hepatitis B in the home were exposed by someone other than their mother — directly challenging the CDC's recent decision to end universal birth dose vaccination. Researchers warn that focusing only on maternal infection status leaves infants vulnerable to fathers, grandparents, and other household contacts. Critics say the policy shift could drive a significant rise in chronic infections.
A retrospective cohort study presented at IDWeek found that among children under 5 with hepatitis B virus (HBV) exposure in the home, 58.2% were exposed through non-maternal household contacts — think dads, grandparents, or other relatives — compared to just 41.8% exposed via their mothers. The findings directly challenge the CDC's Advisory Committee on Immunization Practices (ACIP), which recently reversed over 30 years of vaccine policy by dropping the recommendation for a universal HBV birth dose in infants born to HBsAg-negative mothers.
Researchers from Kaiser Permanente Northern California analyzed data from over 158,000 children, finding that 1.3% lived in households with an active HBV infection. Notably, 4.2% of children exposed by a non-maternal contact were still unvaccinated at 30 days of age — falling within the new ACIP-recommended delay window of at least 2 months for the first dose.
By the Numbers:
Why it matters: HBV infection acquired in infancy is highly likely to become chronic, with lifelong consequences including liver cancer. By narrowing focus to maternal infection status alone, the new ACIP policy may leave a significant — and preventable — gap in infant protection.
