Case count may be as high as 235.

Health officials in Iowa, Nebraska, Texas and Wisconsin continue to investigate an outbreak of gastrointestinal illness caused by Cyclospora, a microscopic parasite.  Illinois, with 2, and Kansas, with 1, may also have linked cases.

Wisconsin health officials say there are four cases  in Brown, Grant, and Milwaukee counties.

The number of people reporting a food-borne intestinal illness believed to have come from a contaminated vegetable has climbed to 63 cases in Nebraska, including 37 in Douglas County.

In Iowa 109 people in 31 counties were confirmed sick as of Thursday.

56 cases have been reported in Texas this past week alone, officials said Friday.  Most reports come from the Dallas/Fort Worth area.

Public health officials say the illness, which causes prolonged diarrhea, is rare. It comes from eating food or drinking water contaminated with feces containing the Cyclospora.

Officials say the illnesses began in June, leading them to believe whatever produce caused it may have been eaten or thrown away by now.