According to the CDC, at least 39 people across seven states have confirmed or suspected cases of Campylobacter bacteria, which can cause diarrhea, abdominal pain and fever. While the investigation is ongoing, federal officials have linked it to contact with puppies sold by Petland, a chain of pet stores based in Ohio.

Twelve of the confirmed cases are in Petland employees, and 27 other people who fell ill either visited a Petland, recently purchased a puppy there, or visited or live in a home with a Petland puppy. According to the CDC’s announcement, nine people have been hospitalized and there are no reported deaths.