An outbreak of botulism tied to ByHeart baby formula has made at least 15 infants sick in 12 states, a California health official said Monday. The company announced Tuesday that it is expanding its voluntary recall to include all products while the investigation continues.

Nine cases of infant botulism type A have been confirmed, with results on six others pending, said Dr. Erica Pan, health officer for the California Department of Public Health. That's an increase from 13 cases in 10 states reported on Saturday .

Federal and state officials are investigating the outbreak, which began in mid-August. No deaths have been reported.

ByHeart, a maker of organic baby formula based in New York, initially recalled two lots of its Whole Nutrition Infant Formula over the weekend. It has now

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