Federal vaccine advisers are gathering this week to consider significant changes to childhood immunizations, including a reexamination of the newborn hepatitis B shot and a broader review of the entire childhood vaccine timetable that protects children from more than a dozen diseases such as measles, mumps, pertussis and polio.
The Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices (ACIP) will meet Thursday and Friday to review the recommended sequence and timing of more than 30 doses given across infancy and childhood. ACIP’s guidance strongly influences how clinicians vaccinate and affects insurance coverage for those shots.
The meeting follows a major reshaping of the committee earlier this year, when Health and Human Services Secretary Robert F. Kennedy Jr. replaced many members with his own appointees. That overhaul, and subsequent shifts in CDC policy, have drawn criticism from major medical societies and public health experts, who warn the changes could undermine vaccine confidence and reverse decades of progress in preventing infectious disease.
Supporters of the new direction include allies of Secretary Kennedy and vaccine-skeptical groups. Mary Holland of Children’s Health Defense praised what she called “truth telling about vaccines,” reflecting long-standing skepticism among some organizations about vaccine safety. Many pediatric and public health leaders say the revamped ACIP has lost the trust of professional societies and now relies less on external medical collaboration and CDC subject-matter expertise.
Tensions flared during the committee’s September session, when a planned vote on the hepatitis B policy was delayed amid confusion. The ACIP chair has since been replaced; the new chair is a pediatric cardiologist with ties to a group that promoted unproven COVID-19 treatments, a fact that has added to experts’ concerns.
Those concerns deepened after the CDC altered its public stance this year on whether vaccines might play any role in autism — a position at odds with extensive research showing no causal link — prompting independent medical groups, including the American Academy of Pediatrics and the American Academy of Family Physicians, and a new Vaccine Integrity Project to issue their own guidance. A few states have begun adopting some of those alternative recommendations.
Hepatitis B and the newborn dose
Perhaps the most concrete potential change under consideration is whether to revisit the long-standing recommendation that all newborns receive a hepatitis B vaccine within 24 hours of birth. Options discussed range from delaying that first dose to requiring a more extensive discussion with parents before vaccination.
Advocates for changing the universal newborn policy argue that hepatitis B is most commonly spread through sexual contact or injection drug use, and that targeted strategies — such as screening pregnant people and vaccinating infants born to infected mothers — might be sufficient. They note that some other countries do not routinely give a birth dose.
Public health experts counter that hepatitis B is highly infectious and can spread through exposure to infected body fluids or contaminated household items. Infants infected early are much more likely to develop chronic infection, which raises lifetime risks of liver disease and cancer. Analysis presented to ACIP suggests even modest delays in the birth dose could result in hundreds of preventable deaths and more than $200 million in added health-care costs each year. Proponents of the current policy point to the birth dose’s role in dramatic declines in pediatric hepatitis B and emphasize the vaccine’s long safety record.
Rethinking the schedule
A new ACIP working group will present its initial report as part of a broader reexamination of the childhood immunization schedule. Public health officials say this scrutiny is coming at a precarious moment: vaccination rates have slipped in places, and outbreaks of vaccine-preventable diseases have increased. “We have seen more measles cases in our country this year than we have in recent history,” said Dr. Raynard Washington, a county public health director in North Carolina, noting local rises in pertussis as well. Officials warn that added barriers, mixed messages, or confusion could further depress immunization uptake and endanger children.
Proponents of the current timing emphasize that each vaccine and its recommended schedule are chosen based on when children are most vulnerable and when their immune systems respond best. Delaying or spreading out doses, they say, leaves children needlessly exposed at ages when complications can be most serious. Critics question whether the cumulative number of antigens or vaccine ingredients could overwhelm infants’ immune systems, but specialists point out that children are constantly exposed to far larger amounts of immune stimuli from the environment and that modern vaccines are formulated to minimize unnecessary components.
Other specific topics under review include whether to split combination vaccines into separate shots and the safety of aluminum-containing adjuvants. Splitting vaccines such as the MMR could increase clinic visits and injections, potentially lowering completion rates and leaving more children incompletely protected. The working group is also examining aluminum adjuvants, which have been used for decades to boost immune responses. Some critics assert links between aluminum and conditions such as asthma or autism, but large epidemiologic studies and toxicology assessments find no evidence that vaccine aluminum causes these disorders. Experts note that people are exposed to far more aluminum from food and the environment than from vaccines, and they caution that removing aluminum would reduce the effectiveness of several longstanding vaccines and require years to develop suitable replacements.
Voices in the debate
Pediatric infectious disease specialists say vaccine policy reflects a balance of immunologic science and population-level risk. “Every vaccine on that schedule and the recommended timing of it exists for a reason,” said Dr. Sean O’Leary, chair of the American Academy of Pediatrics’ committee on infectious diseases. He and others emphasize that pediatricians work with families to support informed decision-making while prioritizing protection against serious, potentially life-threatening infections.
Public health scholars who study vaccine-preventable disease control urge caution about making changes to policies that have demonstrably reduced illness and death. The upcoming ACIP meeting is expected to be closely watched and contentious: advocates of change see an opportunity to rethink long-standing practices, while many in public health warn that dismantling established recommendations or raising doubts about vaccine ingredients could accelerate declines in childhood vaccination and allow preventable diseases to resurge.