The Outbreak at a Glance

Federal health officials are investigating a significant multistate outbreak of infant botulism linked to a powdered infant formula. The situation is dynamic, with case counts rising as the investigation progresses.

The following table outlines the states where cases have been reported as of November 19, 2025:

Investigation Timeline and Key Findings

The investigation, a collaborative effort between the U.S. Food & Drug Administration (FDA) , the Centers for Disease Control and Prevention (CDC) , the California Department of Public Health (CDPH) , and the Infant Botulism Treatment and Prevention Program (IBTPP) , has evolved rapidly, with critical findings emerging over a matter of days.

The table below summarizes the key developments in the investigation:

Epi

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