No new cases were added to the investigation since the update on December 10, 2025.
During recent weeks, public health officials reviewed the medical records of the 51 infants who were initially included in the investigation and used additional criteria to describe the cases (see table).
As of February 26, 2025, the investigation
- included 28 cases of confirmed infant botulism,
- included 20 cases of probable infant botulism, and
- excluded 3 cases initially suspected to be infant botulism but ultimately diagnosed with other illnesses.
For the 48 cases now included in the investigation,
- The infants were from 17 states (see map).
- Illnesses started on dates ranging from December 24, 2023, through November 29, 2025 (see timeline).
- All 48 infants were hospitalized and treated with BabyBIG®, a medication used to treat infant botulism. No deaths were reported.
- The infants ranged in age from 16 to 264 days and 22 (46%) were female.
