AP reports that North Dakota health officials are investigating an outbreak of Salmonella that has sickened 22 people since late July.

The state Health Department says investigations into the outbreak have shown that the infections have the same genetic pattern and may have originated from a common source. Officials, however, have been unable to identify a common food item, place or event where all of the cases may have been exposed.

Salmonella symptoms include fever, diarrhea, nausea, vomiting and abdominal cramps.

Officials say 14 of the cases have been from Ward County. The patients who weren’t from that county reported traveling to that area.

This outbreak cluster is not apparently related to the ongoing Salmonella cucumber outbreak.