Washington D.C. — Multiple crucial federal government datasets, including several widely used national health surveys and data dashboards maintained by the Centers for Disease Control and Prevention (CDC), were rendered inaccessible on Friday, January 31, 2025, sending ripples of concern through the public health, research, and media communities.
These vital resources, which serve as foundational pillars for informing critical research, guiding policy making, and underpinning media coverage on health care and public health issues across the United States, displayed unsettling “page not found” messages to users attempting to access them throughout Friday and into Saturday.
Datasets Return with Warning
By Sunday, February 2, 2025, a partial restoration of access began, with some landing pages for the affected datasets returning online. However, the return was accompanied by a prominent warning message displayed on the CDC’s website stating, “CDC’s website is being modified to comply with President Trump’s Executive Orders.” This notification signaled potential future alterations to the site and its contents, raising questions about the scope and nature of upcoming changes.
While some core survey data files appeared to be back online and intact following the weekend’s outage, essential supporting documentation remained inaccessible. Resources critical for data analysis, such as questionnaires and codebooks – which researchers rely upon to understand data variables, methodologies, and limitations – were still missing as of Sunday. Additionally, some related reports derived from these datasets also remained offline, further complicating efforts to access and utilize the information.
Key Public Health Resources Affected
The temporary removal of these resources impacted several high-profile and long-standing federal health data initiatives. Among the most significant was the Behavioral Risk Factor Surveillance System (BRFSS). The BRFSS is a premier source of state-level data on health behaviors, preventative health practices, and healthcare access throughout the United States. It is particularly valuable and frequently utilized for generating insights in low-population and rural areas where other comprehensive health data may be scarce.
Beyond the BRFSS, datasets critical to understanding and combating infectious diseases and global health challenges were also affected. These included data related to HIV/AIDS in the U.S. and resources supporting global health efforts. Specifically, the CDC AtlasPlus database, a comprehensive surveillance resource containing data for HIV, viral hepatitis, STD, TB, and social determinants of health, was temporarily taken offline. Historical CDC HIV surveillance reports, crucial for tracking trends and evaluating interventions over time, were also among the inaccessible resources.
Impact on Research, Policy, and Information
The sudden unavailability of these datasets and their accompanying documentation represents a significant disruption for a wide array of users. Researchers rely on these public datasets to conduct studies, identify trends, and publish findings that advance scientific understanding of public health challenges. Policy makers at federal, state, and local levels utilize this data to assess population health needs, design interventions, and allocate resources effectively. Media organizations frequently reference these statistics to inform the public about health issues and track progress on public health goals.
The lack of access to questionnaires and codebooks, even when data files are available, severely hampers researchers’ ability to properly analyze and interpret the data. Without these guides, understanding how data points were collected or defined becomes challenging, potentially leading to misinterpretations or the inability to use the data at all. The inaccessibility of reports further limits the immediate availability of key findings and summaries.
As of Sunday, February 2, 2025, while some elements had returned, the situation highlighted the vulnerability of public access to critical health information systems and raised concerns about the future availability and format of these essential federal datasets, particularly in light of the stated compliance with Executive Orders.
