(CBS NEWS) – According to CBS, ByHeart, a maker of baby formula whose products have been linked to a botulism outbreak that has sickened dozens of infants around the U.S, said that all its formula may have been contaminated.

In a Nov. 24 update posted on the company’s website, ByHeart said that five of 36 samples tested positive for Clostridium botulinum Type A, the bacteria that can cause the potentially deadly illness.

“Based on these results, we cannot rule out the risk that all ByHeart formula across all product lots may have been contaminated,” the company said in a statement.

As of Nov. 19, at least 31 cases of reported infant botulism in 15 states have been tied to various shipments of the ByHeart Whole Nutrition infant formula, according to the FDA. No deaths have been reported.

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