Public health officials are investigating an outbreak of gastrointestinal illness among people who ate at Hinerwadel’s Grove in North Syracuse.

At least seven people in Central New York became ill with the bacterial infection Campylobacter after eating at Hinerwadel’s Sept. 15, according to the Onondaga County Health Department. The infection can cause diarrhea, abdominal cramps and fever. People who become ill from the infection can have symptoms for up to two weeks.

The incubation period for the infection can be as long as 10 days. Dr. Cynthia Morrow, the county’s health commissioner, said she anticipates the number of people ill associated with the outbreak will grow.

The Health Department said there is no indication of improper food handling at Hinerwadels. The department said it is working to determine the source of the infection.

The Health Department is asking anyone who ate at Hinerwadel’s on or after Sept. 15 and who became ill to call the department at 435-6607.

More than 200 people got sick at Hinerwadel’s in 2008 from the same infection. Raw mahogany clams were suspected as the source of that outbreak.