Two suppliers provided dried milk powder that could be a culprit in the outbreak of botulism tied to ByHeart infant formula that has sickened dozens of babies, The Associated Press has learned. Organic whole milk powder that tested positive for the type of bacteria that causes botulism was made from milk provided by Organic West Milk Inc., a California company, and processed at a Dairy Farmers of America plant in Fallon, Nevada, company officials said. The source of the contamination, however, is not yet known.