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Nearly half of the databases that public health officials at the Centers for Disease Control and Prevention were updating on a monthly basis have been frozen without notice or explanation, according to a study published in the Annals of Internal Medicine.

The study—led by Janet Freilich, a law expert at Boston University, and Jeremy Jacobs, a medical professor at Vanderbilt University—examined the status of all CDC databases, finding a total of 82 that had, as of early 2025, been receiving updates at least monthly. But, of those 82, only 44 were still being regularly updated as of October 2025, with 38 (46 percent) having their updates paused without public notice or explanation.

Examining the databases’ content, it appeared that vaccination data was most affected by the stealth data freezes. Of the 38 outdated databases, 33 (87 percent) included data related to vaccination. In contrast, none of the 44 still-updated databases relate to vaccination. Other frozen databases included data on infectious disease burden, such as data on hospitalizations from respiratory syncytial virus (RSV).

The finding stood out given that Health Secretary Robert F. Kennedy Jr. is a fervent anti-vaccine advocate who has worked for decades to undermine trust in and use of life-saving vaccines.