The North Dakota Department of Health says an investigation yielded no cause of an E. coli outbreak centered on the Red River Valley Fair earlier this year.

The final report says 62 people were sickened over the course of the Fair this summer. State health officials are unsure if the cause came from one of the food vendors or rather close contact with farm animals.

The report also says no investigation was conducted at the fairgrounds in West Fargo because the first symptoms came to health officials after the fair’s conclusion. Therefore, there were no food vendors or animal attractions still there to be looked at. However, all food vendors are inspected prior to the Fair’s opening.