Robert F. Kennedy Jr., confirmed as US Secretary of Health and Human Services in February 2025, has made recurring claims that the federal government possesses hidden or suppressed adverse-event data about vaccines — sometimes described as a "vault" of concealed CDC or FDA data that would, if released, reveal a broader pattern of vaccine harm than is publicly known. The Vaccine Adverse Event Reporting System (VAERS) is and has long been publicly accessible at vaers.hhs.gov. CDC publishes its vaccine-safety surveillance data through multiple public platforms. HHS and CDC maintain no publicly-disclosed "vault" of suppressed adverse-event data. Specific datasets RFK Jr has cited — including autism-prevalence breakdowns and alleged internal safety signal analyses — are either publicly available or have not been produced as documentary evidence of suppression. The claim that a discoverable vault of hidden data exists is unsubstantiated; questions about specific data granularity and research transparency at federal agencies are a legitimate ongoing policy debate.