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Federal vaccine advisers this week are expected to consider major changes to how babies are immunized against hepatitis B and to scrutinize the broader childhood immunization schedule that protects children against more than a dozen diseases, including measles, mumps, whooping cough and polio.
The Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices (ACIP) meets Thursday and Friday to review the childhood vaccine timetable—the sequence and timing of more than 30 doses given to protect against multiple illnesses. The committee’s recommendations shape how clinicians vaccinate children and influence whether insurers cover shots.
The meeting comes after a dramatic reshaping of ACIP earlier this year, when Health and Human Services Secretary Robert F. Kennedy Jr. replaced many members with his own appointees. That overhaul, and subsequent policy shifts at the CDC, have prompted criticism from many mainstream medical groups and worried public health experts who say the changes risk undermining confidence in vaccines and reversing decades of progress.
Supporters of the new approach include allies of Secretary Kennedy and vaccine-skeptical organizations. Mary Holland of Children’s Health Defense praised “truth telling about vaccines,” reflecting the views of groups that have long questioned vaccine safety. But leaders in pediatrics and public health say the new ACIP has lost the trust of many professional organizations and now relies less on outside medical society collaboration and CDC subject-matter expertise.
The committee’s September session descended into confusion when a planned vote on the hepatitis B vaccine was tabled. The ACIP chair was recently replaced; the new chair, a pediatric cardiologist affiliated with a group that has promoted unproven COVID-19 treatments, has raised further concerns among experts.
Those concerns intensified after the CDC altered its public position this year on whether vaccines might cause autism—a claim thoroughly debunked by extensive research—prompting independent medical groups, including the American Academy of Pediatrics, the American Academy of Family Physicians and a new Vaccine Integrity Project, to issue their own guidance. Some states have begun following these alternative recommendations.
Vaccine schedule under review
A new ACIP working group will present its first report on reexamining the childhood schedule. Public health officials warn that this scrutiny arrives amid rising outbreaks of vaccine-preventable diseases tied to falling immunization rates. “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 increases in pertussis as well. He and others caution that any added barriers or confusion around vaccination could threaten public health.
Proponents of the current schedule emphasize that each vaccine and its timing are chosen based on when children’s immune systems best respond and when they are most vulnerable to specific diseases. Delaying or spreading out vaccines, they say, leaves children needlessly exposed. Critics argue the number of antigens and additives might overwhelm infants, but specialists note children routinely encounter far greater immune stimulation from their environment and that modern vaccines have been refined to minimize unnecessary components.
Hepatitis B discussion
The most tangible potential change is a vote to revisit the recommendation that all newborns receive the hepatitis B vaccine within 24 hours of birth. Options under consideration could include delaying that first dose or requiring an extended discussion with parents before giving it.
Advocates of changing the universal newborn dose say hepatitis B is often transmitted through sexual contact or injection drug use and that targeted approaches—like screening pregnant women and vaccinating infants born to positive mothers—could suffice. They point to other countries that do not routinely give a birth dose.
Public health experts counter that hepatitis B is highly infectious and can be spread through exposure to infected body fluids or contaminated household items. Most infants who acquire hepatitis B go on to chronic infection, increasing lifetime risk of liver disease and cancer. A recent analysis presented to ACIP authors suggests even a modest delay in the birth dose could produce hundreds of preventable deaths and more than $200 million in excess healthcare costs annually. Defenders of the current policy say the birth dose has been central to dramatic reductions in hepatitis B infections and that the vaccine has a long, strong safety record.
Other possible changes and concerns
ACIP members are also considering whether to split combination vaccines—such as the MMR that protects against measles, mumps and rubella—into separate shots. Critics of splitting warn it would mean more clinic visits and injections and could reduce overall completion rates, leaving more children unprotected.
The working group is examining the safety of aluminum-containing adjuvants, ingredients used in many vaccines for decades to boost immune response. Some critics claim aluminum poses risks, including links to asthma, autism or other conditions, but large studies and toxicology assessments find no evidence that vaccine aluminum adjuvants cause these problems. People are exposed to far more aluminum routinely via food and the environment than through vaccines. Experts warn that removing aluminum would undermine the efficacy of several longstanding vaccines and that replacement formulations would take years to develop.
Voices in the debate
Pediatric infectious disease experts emphasize that vaccine policy reflects a balance of immunologic science and population risk. “Every vaccine on that schedule and the recommended timing of it exists for a reason,” said Dr. Sean O’Leary, who chairs the American Academy of Pediatrics’ committee on infectious diseases. He and others stress that pediatricians work with parents and support informed decision-making, while prioritizing protection against serious diseases. Public health scholars who study vaccine-preventable disease control urge caution about altering policies that have demonstrably reduced illness and death.
The ACIP meeting is likely to be closely watched and contentious. Advocates for change see an opportunity to rethink long-standing practices, while many in public health warn that dismantling established recommendations or sowing doubt about vaccine ingredients could accelerate declines in childhood vaccination and allow preventable diseases to resurge.
