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The California Department of Public Health (CDPH) is reporting that at least six cases of infant botulism were detected between November 2024 and March 2025. All of the sick infants were fed the formula, according to the U.S. Centers for Disease Control and Prevention. The spokesperson explained that in early 2025 there was not enough evidence to immediately suspect a common source among the six suspected cases, and that the number of cases were within expected case numbers based on previous years' trends. The CDC and Food and Drug Administration began their investigation into the outbreak after officials with CPDH's Infant Botulism Treatment and Prevention Program alerted them to an increase in requests for the treatment.