BLUE HILL, Neb. (AP) — Health officials are investigating an outbreak of salmonella at a care center in Blue Hill in south central Nebraska.

Officials say 17 cases of the illness have been confirmed and two probable or suspect cases have been reported in Blue Hill Care Center residents, staff and visitors.

The South Heartland District Health Department says four residents were temporarily hospitalized after showing symptoms. A visitor was also hospitalized. Director Michele Bever says the first cases were reported in early August, and officials are still looking for the source.

Beaver says Tuesday that they’re looking at food as well as potential exposures from pets.

Salmonella can cause diarrhea, fever and stomach pain. It’s most dangerous to young children, the elderly and people with weakened immune systems.