TEC Briefs
TEC Briefs are focused, actionable documents that synthesize critical information on time-sensitive public health topics. They deliver multidisciplinary perspectives to public health leaders when rapid, evidence-based decision-making is essential.
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On December 4–5, 2025, the CDC's Advisory Committee on Immunization Practices (ACIP), now entirely composed of members handpicked by HHS Secretary Robert F. Kennedy Jr., devoted significant time to questioning the safety of aluminum adjuvants in childhood vaccines.
This brief synthesizes the current evidence to support healthcare providers and science communicators in addressing public questions about aluminum adjuvant safety. It is a collaboration between The Evidence Collective (TEC) and the Expert Vaccine Analysis Team (EVAT).
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Looking across the June, September, and December 2025 ACIP meetings reveals a critical trajectory. Early June discussions tended to focus on individual products or narrow data points. By September, problematic claims increasingly involved clinical trial design, evidence standards, and regulatory processes. By December, multiple statements reflected broad and inaccurate characterizations of the childhood immunization schedule, vaccine safety science, and the legal and ethical frameworks that govern vaccine policy in the United States.
This document consolidates selected examples from ACIP’s 2025 meetings based on their potential relevance to clinical practice, public understanding, or vaccine policy, and was evaluated against primary sources, including peer-reviewed studies, systematic reviews, and broader scientific evidence. Its purpose is to clarify where scientific standards were strained or misapplied, to support transparency and public understanding, and to help anticipate future ACIP meetings, the earliest of which is expected to take place in February 2026.
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On January 5, HHS released a memo stating that the CDC's recommendations on childhood vaccines will be updated to align more closely with those of other high-income countries. Here we have responded to the announcement.
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In early January 2026, RFK Jr. is expected to “Make an announcement on children’s health.” While details remain limited, the New York Times reports that HHS sources indicate the announcement may involve moving the United States vaccine schedule to the Danish schedule. We hope this document serves as a helpful resource as events unfold.
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Document covering predicted topics of discussion in the upcoming December ACCV meeting.
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The December ACIP meeting was held over December 4th and 5th and resulted in changes to HepB vaccination recommendations and discussions of the childhood vaccine schedule as well as vaccine residual components (i.e. aluminum). Here we have broken the two-day event into themes and responded to the claims/concerns.
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Document covering predicted topics of discussion in the upcoming December ACIP meeting.
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Community Water Fluoridation (CWF) is one of the most studied public health interventions, consistently shown to reduce cavities and save money across populations. Large reviews, such as Cochrane’s, find that children and adults in fluoridated areas have fewer cavities, and real-world examples show tooth decay increases when fluoridation stops. The balance point used in the U.S. (about 0.7 mg/L) aims to prevent decay while minimizing cosmetic fluorosis. Economic studies report strong returns on investment, especially in communities with limited dental access. While some prenatal-exposure studies have linked higher fluoride levels to small IQ differences, these typically involve exposures higher than those in U.S. water systems; long-term studies at community fluoridation levels have not found IQ effects.
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The September 22, 2025 presidential briefing addressed autism causation topics with officials presenting approximately 25 false or misleading claims that were subsequently amplified across media channels. These included misrepresentations about acetaminophen (Tylenol) as an autism cause, folate deficiency theories lacking scientific support, vaccine-autism links contradicted by decades of research, and FDA plans to approve Leucovorin for autism management without meeting typical evidence standards. This fact-check brief documents specific false or misleading claims presented during the briefing, provides scientific corrections with peer-reviewed citations, examines departures from evidence-based regulatory processes, analyzes public health implications of promoting unproven treatments while discouraging safe medical interventions, and offers factual resources for health communicators countering autism misinformation.
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The September 18-19, 2025 ACIP meeting addressed three vaccine topics with the newly appointed committee presenting approximately 30 false or misleading claims that were subsequently amplified across media channels. These included misrepresentations about MMRV (measles, mumps, rubella, varicella) vaccine safety and febrile seizure risks, hepatitis B birth dose necessity citing inappropriate animal studies, and COVID-19 vaccine safety claims ranging from DNA contamination to fabricated syndromes. This fact-check brief documents specific falsehoods presented during the meeting, provides scientific corrections with peer-reviewed citations, examines departures from evidence-based evaluation processes, analyzes public health implications of the committee's decisions, and offers factual resources for health communicators countering vaccine misinformation.
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The September ACIP meeting is scheduled for September 18-19. Based on the released agenda, we anticipate three key vaccine safety topics to surface, along with several falsehoods likely to be raised and amplified on social media. These include the safety of the MMRV (measles, mumps, rubella, varicella) combination vaccine and its association with febrile seizures, Hepatitis B vaccine safety and necessity, in particular the birth dose, and both pediatric and adult COVID-19 vaccine safety, focused particularly on deaths. This report provides key background on each issue, anticipates falsehoods and rumors likely to arise or be distorted, summarizes current evidence, outlines possible policy implications, and offers communication guidance for public health leaders, media, and social media influencers.
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The Senate Finance Committee hearing with HHS Secretary Robert F. Kennedy Jr. — focusing on the administration's healthcare agenda — provided Congress an opportunity to evaluate federal health policy trajectory under his leadership. Based on Secretary Kennedy's testimony and his positions on medical science, we documented 12 false or misleading statements about vaccines that were raised and amplified on social media. This report provides detailed fact-checking of each claim, addresses falsehoods and rumors that arose during the hearing, summarizes current scientific evidence with citations, and outlines the possible policy implications of the misinformation communicated from the highest levels of federal health leadership.
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Day two of the newly restructured ACIP committee concluded with discussions on RSV, influenza, and MMRV vaccines, focusing on disease burden, safety, and effectiveness. The meeting was marked by significant procedural irregularities and concerning misinformation. Most notably, the committee voted to remove thimerosal from flu vaccines despite a lack of evidence of harm and decades of safety data, setting a troubling precedent for policy decisions based on hypothetical risks rather than evidence. The meeting featured a controversial presentation by Lyn Redwood that bypassed normal review processes and contained cherry-picked, outdated data with clear anti-vaccine bias. We documented over 50 inaccuracies across both days, with at least 22 occurring today alone, requiring extensive real-time fact-checking. This debrief provides comprehensive fact-checking of claims made, contextualizes discussions within current scientific evidence, and offers guidance for public health leaders and media responding to the meeting's outcomes.
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Day one of the newly restructured ACIP committee focused on COVID-19 and RSV discussions, covering ongoing disease burden, vaccine safety, and effectiveness. While CDC presentations were thorough and professional, the meeting was disrupted by significant misinformation; we documented at least 28 falsehoods requiring real-time fact-checking. This debrief provides rapid fact-checking of falsehoods raised, contextualizes the discussions within current evidence, and offers communications guidance for public health leaders and media responding to meeting coverage and social media amplification of misinformation.
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The June ACIP meeting, the first with the newly appointed committee, is scheduled for June 25-26. Based on the makeup of the committee and last-minute changes to the agenda, we anticipate four key vaccine safety topics to surface, along with several falsehoods likely to be raised and amplified on social media: The MMRV (measles, mumps, rubella, varicella) combination vaccine and its association with febrile seizures, Thimerosal in flu vaccines, RSV protection during pregnancy and a new monoclonal antibody introduced without a placebo-controlled trial, and Covid-19 vaccines and spontaneous abortion, including a preprint released Friday, authored by a new ACIP member with a history of anti-vaccine rhetoric, a timing we believe is strategic, given its release just days ahead of the meeting. This report provides key background on each issue, anticipates falsehoods and rumors likely to arise or be distorted, summarizes current evidence, outlines possible policy implications, and offers communication guidance for public health leaders, media, and social media influencers.