Powdered whole milk could be a culprit in the ByHeart botulism outbreak, tests show

Powdered whole milk used to make ByHeart infant formula could be a source of contamination that led to an outbreak of botulism that has sickened dozens of babies, U.S. health officials indicated Friday.

Testing by the U.S. Food and Drug Administration found the type of bacteria that can cause the illness in two samples linked to the formula, officials said.

The agency found that bacteria in an unopened can of formula matched a sample from a sick baby — and it also matched contamination...