38 CDC disease tracking databases stopped updating as the US outbreak early-warning system goes dark

A peer-reviewed study published in the Annals of Internal Medicine in January 2026 found that 38 of 82 CDC databases updated at least monthly had stopped receiving new data by October 2025 — 34 of them showing no new entries for six months or more. The study was authored by researchers at UCSF and Harvard T.H. Chan School of Public Health, who manually tracked update status for every CDC public health database over a 12-month period.

The pauses were not announced publicly, were not accompanied by explanatory notices on the CDC website, and were not authorized by any congressional action. HHS described them as 'routine data quality and system management decisions, not political direction' — a characterization the study authors said was inconsistent with the pattern they observed.

Of the 38 paused databases, 33 — or 87% — track vaccination data. Among the paused vaccination databases: the National Immunization Survey (NIS), which tracks childhood vaccination coverage nationally and by state; the Immunization Information System (IIS), a registry of administered vaccines; and multiple surveillance systems tracking vaccine-preventable disease rates against vaccination coverage benchmarks.

Of the 44 databases that remained current through October 2025, zero tracked vaccination data.

The timing of the pauses concentrated in March and April 2025 — coinciding with Robert F. Kennedy Jr.'s February 13 Senate confirmation as HHS Secretary. One researcher described the pattern as 'hard to explain by any process other than a deliberate decision to stop updating vaccination surveillance.'

FoodNet — formally the Foodborne Diseases Active Surveillance Network — has operated since 1996 as a sentinel system tracking infections from eight foodborne pathogens across ten states (🌴California, 🏔️Colorado, 🦞Connecticut, 🍑Georgia, 🦀Maryland, 🦆Minnesota, 🌶️New Mexico, 🗽New York, 🌲Oregon, and 🎸Tennessee). The ten-state network covers approximately 15% of the U.S. population and is designed to produce nationally representative estimates of foodborne illness burden.

Since its founding, FoodNet has tracked: Campylobacter, Listeria, Salmonella, Shiga toxin-producing E. coli (STEC), Shigella, Vibrio, Yersinia, and Cyclospora.

As of July 1, 2025, CDC restricted active FoodNet surveillance to only Salmonella and STEC. The other six pathogens are no longer subject to federal active surveillance requirements.

Campylobacter — the most common foodborne bacterial pathogen in the United States — caused an estimated 1.9 million illnesses in 2019 according to FoodNet data, more than Salmonella. Campylobacter primarily comes from undercooked poultry and unpasteurized dairy, causes severe gastrointestinal illness lasting 5-10 days, and can trigger Guillain-Barré syndrome — a potentially paralyzing autoimmune condition — in approximately 1 in 1,000 cases.

Its removal from FoodNet's active surveillance targets means federal public health authorities can no longer reliably estimate national Campylobacter incidence, identify geographic clusters that could indicate a contaminated food source, or measure whether intervention strategies are working. Listeria — which kills approximately 260 Americans per year and causes 94% of infected pregnant women to experience pregnancy complications — was similarly removed.

The practical consequence of losing FoodNet's pathogen coverage is a degraded ability to detect food supply contamination before it spreads nationwide. The CDC's outbreak detection infrastructure has two main layers: PulseNet (a laboratory genomic network that sequences pathogen strains and matches them across cases) and FoodNet (a population-level surveillance system that provides the denominators — how many infections are occurring overall — needed to determine whether a PulseNet cluster represents an unusual spike).

Without FoodNet data on Campylobacter, Listeria, Shigella, and the other dropped pathogens, PulseNet clusters in those categories lack the epidemiological context needed to declare an outbreak with confidence or to trigger a food recall. Former CDC Director TFTom Frieden called the FoodNet cuts 'a serious blow to America's ability to detect and respond to food safety emergencies.'

The 38 paused databases include systems beyond vaccination and foodborne illness. The Cancer Registry — which tracks cancer incidence, treatment, and survival rates nationally by linking data from state registries — paused updates in March 2025.

The National Vital Statistics System, which produces mortality data including cause-of-death statistics used to track overdose deaths, maternal mortality, and cardiovascular trends, paused in April 2025.

The Behavioral Risk Factor Surveillance System (BRFSS) — a 40-year-old telephone survey tracking adult health behaviors including obesity, tobacco use, and physical activity across all 50 states — paused in May 2025. The CDC's HIV surveillance system paused updates to its county-level data dashboard in June 2025. Each pause represents a gap in the baseline data that epidemiologists, state health departments, and hospital systems use to allocate resources, monitor trends, and measure the effectiveness of public health interventions.

No congressional vote or administrative rule-making authorized any of the database pauses. The Administrative Procedure Act generally requires federal agencies to provide notice and opportunity for comment before changing policies that affect the public — but internal data management decisions, if characterized as administrative rather than policy changes, may not trigger APA requirements.

Public health law experts argued in a February 2026 Stat News analysis that the cumulative effect of the pauses constitutes a de facto restructuring of the CDC's public health monitoring function — one that would require congressional authorization if done openly as a policy change, but that was implemented through operational decisions below the threshold of formal rulemaking. No congressional hearing had been held on the database pauses as of February 2026.

RFK Jr.'s broader approach to federal health data includes the DOGE-linked dismantlement of the CDC's data infrastructure. Between February and June 2025, DOGE terminated contracts with data analytics firms that provided the CDC's data processing and visualization capacity, including a $19 million contract with McKinsey and a $7 million contract with Palantir for disease surveillance analytics.

These contract terminations preceded the database update pauses, suggesting a staffing and infrastructure reduction that made continued updates operationally impossible even if the policy intent remained. The CDC's Atlanta headquarters saw approximately 2,000 employees — roughly 17% of its workforce — depart through layoffs, buyouts, and forced resignations between January and August 2025.