The unharmonious 2026 child and adolescent immunization schedule - addendum

Several developments relevant to the childhood and adolescent immunization schedule have occurred in rapid succession since submission of our manuscript.

mRNA influenza vaccine approval

On August 5, 2026, the FDA approved the first mRNA-based influenza vaccine (mFLUSIVA; Moderna) for adults ≥50 years of age.¹ Compared to the inactivated influenza vaccine, the mRNA product demonstrated approximately 27% superior relative efficacy in this population. Although more reactogenic than the inactivated comparator, all adverse effects were transient. Key advantages of mRNA influenza vaccines include enhanced immunogenicity and rapid manufacturability, enabling closer antigenic matching to circulating strains.² Studies in younger adults are ongoing.

New CDC director

Retired Rear Admiral Dr. Erica G. Schwartz was confirmed by the US Senate on August 5, 2026, and sworn in on August 13, 2026.³ She assumed leadership as the CDC confronts simultaneous challenges: measles outbreaks, a domestic Cyclospora outbreak, an Ebola outbreak caused by Bundibugyo virus in Africa, and significant budget and personnel cuts that have diminished agency morale. A board-certified preventive medicine physician with a history of supporting military vaccine mandates, Dr. Schwartz testified before the Senate that she would restore public trust through "radical transparency" and "unwavering scientific integrity," pledging never to "betray the science." How she will navigate the fallout from the President's executive order aimed at restructuring childhood vaccine policy remains uncertain. Her predecessor, Dr. Susan Monarez, was dismissed after less than a month for declining to support schedule changes strongly advocated by the Secretary of Health and Human Services.³

Revised ACIP and NVAC charters

The charters of the ACIP and the National Vaccine Advisory Committee (NVAC) were recently revised in ways that may further erode the current vaccine schedule. The NVAC traditionally advised the Director of the National Vaccine Program on strategies to prevent infectious diseases through safe, widespread immunization. Charter revisions no longer mandate vaccine-specific expertise; instead, they emphasize a "balanced range of scientific, clinical, and public health expertise" that now explicitly includes public members from parent organizations concerned about immunizations and permits a minority of members from academia or industry while opening membership to individuals who may be vaccine-skeptical. Both committees are now directed to consider non-immunization alternatives — such as healthy lifestyle modifications, off-label drug use, and immune-supporting dietary supplements — for individuals unable or unwilling to vaccinate. Increased emphasis on purported knowledge gaps in vaccine data risks being leveraged to delay or rescind vaccine recommendations, with potentially serious public health consequences.

Presidential executive order on childhood vaccines

On August 10, 2026, the President signed Executive Order No. 14420, "Delivering Gold Standard Childhood Vaccine Recommendations for Americans," emphasizing "maximal parental choice" consistent with principles of personal autonomy and informed consent.⁴ The order directs that the MMR vaccine be administered as "three separate single-disease shots once such products are domestically available" and that, "to the maximum extent feasible," all childhood immunizations occur at separate medical visits. It calls for reassessing the timing and sequencing of core childhood vaccines, improving vaccine safety monitoring, and directs the Attorney General to challenge state laws that limit religious or medical exemptions. While the Executive Order carries no statutory force and states retain authority over school vaccine mandates, the Department of Justice could pressure states with limited exemption policies to loosen requirements. The practical consequences of dismantling combination vaccines are well established: lower vaccination rates, increased logistical and financial burdens on families and clinicians, and unnecessary distress to children from additional injections — with no compensating medical benefit. Monovalent measles, mumps, and rubella vaccines are not currently available in the United States and would require years to bring to market; notably, commonly cited comparator countries such as Denmark administer only the combined MMR vaccine, not its individual components. Pediatricians must proactively and clearly advocate to families for the immunization schedule endorsed by the American Academy of Pediatrics and other professional medical organizations.

HHS request for information on vaccine recommendation categories

On August 24, 2026, the Secretary of Health and Human Services published a Request for Information in the Federal Register (91 FR 54724) soliciting public comment — due by September 20, 2026 — on whether the current federal vaccine recommendation categories (universal; risk-based; shared clinical decision-making) remain adequate, how they are understood in practice, and whether alternative categories (e.g., "recommended, but not during infancy") should be considered.⁵ Pediatricians, other health care providers, public health practitioners, and concerned parents are strongly encouraged to submit comments, regardless of their position, to ensure that evidence-based perspectives are represented in the regulatory record.

Reference

1. Moderna, Inc. Moderna receives US FDA approval for influenza vaccine mFLUSIVA. News release. ACCESS Newswire. August 5, 2026. Accessed September 4, 2026. https://feeds.issuerdirect.com/news-release.html?newsid=4801915282452025

2. Leroux-Roels I, Huang G, Ferguson M, et al. Efficacy and Safety of an mRNA Seasonal Influenza Vaccine in Adults. N Engl J Med. 2026;394(18):1803-1813.

3. Huang P. Dr. Erica Schwartz confirmed as CDC director, filling a leadership vacuum. NPR. Updated August 5, 2026. Accessed September 4, 2026. https://www.npr.org/2026/08/05/nx-s1-5920379/cdc-director-confirmed-erica-schwartz

4. Trump DJ. Executive Order 14420: Delivering Gold Standard Childhood Vaccine Recommendations for Americans. 91 Fed Reg 53173 (August 14, 2026). Accessed September 4, 2026. https://www.whitehouse.gov/presidential-actions/2026/08/delivering-gold-standard-childhood-vaccine-recommendations-for-americans/

5. Department of Health and Human Services. Request for information: categories used in Federal vaccine recommendations and the role of shared clinical decision-making. 91 Fed Reg 54724. August 24, 2026. Accessed September 4, 2026. https://www.federalregister.gov/documents/2026/08/24/2026-17250/request-for-information-categories-used-in-federal-vaccine-recommendations-and-the-role-of-shared