Federal health officials on Wednesday expanded an outbreak of infant botulism tied to recalled ByHeart baby formula to include all illnesses reported since the company began production in March 2022.

The U.S. Food and Drug Administration said investigators “cannot rule out the possibility that contamination might have affected all ByHeart formula products” ever made.

The outbreak now includes at least 51 infants in 19 states. The new case definition includes “any infant with botulism who was exposed to ByHeart formula at any time since the product's release,” according to the U.S. Centers for Disease Control and Prevention. The most recent illness was reported on Dec. 1.

No deaths have been reported in the outbreak, which was announced Nov. 8.

Previously, health officials had said th

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