As cases of potentially deadly botulism in babies who drank ByHeart infant formula continue to grow, state officials say they are still finding the recalled product on some store shelves.

Meanwhile the company reported late Wednesday that laboratory tests confirmed that some samples of formula were contaminated with the type of bacteria that has sickened more than 30 babies in the outbreak.

Tests by an independent food safety laboratory found Clostridium botulinum, a bacterium that produces toxins that can lead to potentially life threatening illness in babies younger than 1, the company said on its website. ByHeart officials said they notified the U.S. Food and Drug Administration of the findings but did not specify how many samples were tested or how many were positive.

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