The Iowa Department of Public Health says the number of cases of the food-borne illness cyclosporiasis has now risen to 60 statewide.
That's up from 45 cases Friday, and just over 20 cases at the start of the week. Usually, Iowa only sees one or two cases per year.
The severe intestinal illness is caused by a rare parasite and requires special testing by your doctor to diagnose.
Symptoms include diarrhea lasting an average of 57 days.
State health officials do not know where it's coming from but they believe fresh vegetables are a likely culprit.
Officials are advising the public to be extra vigilant when preparing produce.
As of July 13, 2013, cyclosporiasis had been identified in the following counties:
· Linn County - 27 cases
· Polk County - 4 cases
· Fayette County - 3 cases
· O'Brien County - 3 cases
· Dallas County - 3 cases
· Buchanan - 3 cases
· Mills County - 2 cases
· Webster County - 2 cases
· Des Moines County - 2 cases
· Black Hawk County - 2 cases
· Benton County - 1 case
· Keokuk - 1 case
· Monona - 1 case
· Butler - 1 case
· Winneshiek - 1 case
· Johnson County - 1 case
· Pottawattamie County - 1 case
· Van Buren County - 1 case
· Story County - 1 case
The next case count will be released Monday, July 15 at approximately 10:00 a.m.