(WXYZ) — The Food and Drug Administration’s investigation into a multi-state outbreak of infant botulism continues. Fifteen infants across 12 states are confirmed or suspected to have the illness, and all were hospitalized.

A major recall has now been issued for ByHeart infant formula.

Botulism is very serious, especially for infants. Thankfully, there have been no deaths so far.

The disease happens when a baby swallows tiny bacterial spores called Clostridium botulinum. These spores can grow in the baby’s large intestine and make a toxin called botulinum toxin. This toxin affects the nerves and stops them from sending signals to the muscles.

It can take several days and up to a few weeks for symptoms to appear after a baby consumes contaminated formula. So, parents should watch for si

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