Scores of new cases have been reported in Iowa , Nebraska . Prepackaged salad mix has been pinpointed as the source of an outbreak of cyclospora -- an intestinal illness tied to a rare type of parasite -- Authorities say a contaminated salad dressing is the cause of the illness . It 's not known whether these states ' outbreaks are related to one in Texas . Cyclospora is a rare parasite found in humans that causes intestinal woes .
Scores of new cases have been reported in Iowa , Nebraska . Authorities say a contaminated salad dressing is the cause of the illness . It 's not known whether these states ' outbreaks are related to one in Texas . Cyclospora is a rare parasite found in humans that causes intestinal woes .