Three senior officials at the U.S. Centers for Disease Control and Prevention resigned in late August, telling TIME in an exclusive report that Department of Health and Human Services Secretary Robert F. Kennedy Jr. repeatedly sidelined career scientists, ignored established research and advanced a vaccine agenda rooted in ideology rather than science.
The departures, disclosed by Dr. Debra Houry, the agency’s former chief medical officer; Dr. Demetre Daskalakis, the agency’s ex‑vaccine chief; and Dr. Daniel Jernigan, who led the department overseeing vaccine safety, came after what the officials described as a pattern of interference and erosion of standard scientific protocols under Kennedy’s leadership. Kennedy has publicly said he would govern with “radical transparency,” follow “gold‑standard science” and maintain vaccine access.
In their accounts to TIME, the officials said Kennedy stacked a key vaccine‑advisory committee with opponents of vaccination and granted special status to a vaccine skeptic that allowed unhampered access to part of a sensitive CDC vaccine database. They said those moves undermined the agency’s ability to evaluate vaccine safety and effectiveness and created internal conflict that prompted their resignations.
The three officials described instances in which they said CDC staff were sidelined from decisions and that established scientific review processes were bypassed. They said Kennedy’s appointments and directives frequently ran counter to the agency’s longstanding practices for evaluating and communicating public‑health guidance.
The officials’ departures follow months of high‑profile disputes between Kennedy and career public‑health staffers. The CDC is the nation’s principal disease‑control agency; its work includes monitoring vaccine safety, conducting epidemiological research and advising federal and state health authorities. The loss of senior leaders who oversaw vaccine programs and safety monitoring raises questions, the officials said, about continuity in those functions.
The officials provided TIME with detailed accounts of internal meetings and personnel moves that they said reflected a broader effort by HHS leadership to shift the CDC’s approach to vaccines. The report says staff morale and retention at the agency have been affected by the disputes.
The controversy comes amid continued public attention on vaccines and pandemic preparedness. The officials who resigned pointed to specific administrative moves they said compromised routine scientific review and data access controls, including the special status granted to a vaccine skeptic that provided access to a portion of a CDC vaccine database they described as sensitive.
Those measures, they said, were accompanied by appointments to advisory bodies that tilted the committees’ composition toward critics of vaccination. Advisory committees influence agency recommendations and can affect public‑health policy at state and federal levels.
The resignations and the officials’ accounts add to a broader debate over how political appointees and career staff should interact within federal health agencies. The CDC’s work depends on the credibility of its scientific assessments and on preserving processes that ensure independent review of data and recommendations.
The officials declined to provide full documentation of their claims for public release to TIME, citing concerns about confidentiality and protections for sensitive public‑health data, according to the report. Their decision to leave the agency was, they said, a last resort after efforts to resolve disputes internally.
The developments are likely to prompt intensified scrutiny from lawmakers and health‑policy stakeholders who monitor the functioning of federal health agencies. The resignations remove senior vaccine program and safety experts from the CDC and could complicate ongoing projects that rely on institutional knowledge and established review frameworks.
The officials’ accounts were published by TIME on Sept. 5, 2025. The report provided previously unreported details about the exodus at the CDC and the internal clashes that preceded it.
As of the TIME report, the senior officials’ departures had not led to immediate public changes in CDC recommendations, but agency observers said the loss of experienced leaders can affect long‑term capacity for surveillance and scientific review. Congressional committees that oversee public‑health agencies have previously held hearings when personnel shifts or policy disputes raised questions about agency independence and scientific integrity.
The resignations underscore tensions between appointees who set policy priorities and the career employees charged with implementing and evaluating them. The CDC and HHS play central roles in the nation’s public‑health infrastructure; how those institutions resolve conflicts over scientific process and data access will be closely watched by public‑health professionals and policymakers.
The former officials said their actions were motivated by concerns about preserving scientific standards and protecting public trust in vaccine programs. Their departures leave open questions about leadership at the CDC and the future direction of federal vaccine policy under Secretary Kennedy’s stewardship.