Study Warns of Increased Vulnerability for Children Under New Hepatitis B Vaccine Guidelines
A new study highlights potential risks of the updated hepatitis B vaccination guidelines, suggesting millions of children could be left vulnerable to infection.
Changes to the hepatitis B vaccination recommendations may increase childhood infections significantly, putting millions of children at risk. A study from Mass General Brigham indicates up to 1.8 million young adults could remain susceptible to the virus due to these alterations.
In December 2025, the Centers for Disease Control and Prevention (CDC) altered its guidelines, moving away from universal hepatitis B vaccination for newborns whose mothers test negative for the virus. Instead, the updated guidance emphasizes shared clinical decision-making between parents and healthcare providers regarding the timing of the vaccine.
Dr. Amir Mohareb, the study’s author, stated, “These findings show why policymakers should re-implement recommendations for universal hepatitis B vaccination at birth.” The study utilized a computer model to evaluate outcomes for 3.6 million newborns over 20 years, comparing vaccination strategies.
Under the previous universal vaccination approach, the model predicted about 232,000 children would remain vulnerable to hepatitis B by age 20. However, the numbers could rise to 474,000 with a delayed vaccination schedule and potentially to 1.8 million with the new shared decision-making approach.
Health experts express concern that this shift could lead to increased chronic hepatitis B infections. Delaying vaccination until children are two months old may raise infections by as much as 19%, while the shared decision-making process could see increases of up to 83% over two decades.
Dr. Alok Patel, a clinical professor of pediatrics at Stanford, mentioned, “The hepatitis B vaccine can prevent potentially life-threatening chronic liver disease, which can lead to liver cancer.” Since the initiation of the infant vaccination program in 1991, infections have reportedly dropped by 99%.
A Kaiser Permanente study also highlights risks associated with relying solely on a newborn’s maternal hepatitis B status. It found that children may be exposed to the virus from household members who are not screened.
The CDC’s shift has not changed the American Academy of Pediatrics’ endorsement of vaccination within 24 hours of a child’s birth. Experts urge families to consult healthcare providers regarding the best course of action to protect their children against hepatitis B.
