State health officials are trying to locate the source of contaminated food that has sickened dozens of people on the Western Slope in the last two months, including diners who ate at Taco del GNAR in Ridgway.

As of Monday, there were 84 confirmed cases of cyclosporiasis in Colorado since May 1, according to Brian Spencer, a spokesman for the Colorado Department of Public Health and Environment. Public health officials have identified 58 people who are likely associated with the outbreak who dine...