In November 2015 public health officials in Illinois investigated an outbreak of gastrointestinal illness among individuals who attended the Pike County Fall color Drive. An estimated 30,000 people attended the festival. One hundred four cases were identified. Consumption of apple cider was a significant risk factor for diarrheal illness. The cider was produced by Yoder Brothers Dairy Farm. Ten samples of cider were tested for Cryptosporidium and E. coli. Subtype Cryptosporidium parvum IIaA17G2R2 was identified in one cider sample and in all five stool specimens submitted for Cryptosporidium subtyping. E. coli O130:H11 was identified in 6 cider samples. Two of eight stool specimens that tested positive for Shiga Toxin E. coli. Serotypes were identified as E. coli O103 and O111. Investigators determined that cider production took place outdoors on a farm within 200 feet of a calf pen. Individuals involved in cider production handled cattle and did not change or disinfect clothes and boots between cattle operations and cider processing. Cider was unpasteurized and containers were unlabeled.