Cases of an intestinal parasite that causes diarrhea have exploded in Michigan over the past two weeks in an outbreak that still has no clear source.
As of July 6, the state has reported more than 700 cases and 36 hospitalizations since June 22, the Michigan Department of Health and Human Services (MDHSS) told Ars Technica on Tuesday.
This was announced by the health department on June 30 170 casesrose up to 572 on July 4.
A microscopic unicellular parasite Cyclospora cayetanensis is behind the events that lead to the disease called cyclosporiasis. Although the infection is generally not life-threatening, it usually causes “watery diarrhea with frequent and sometimes explosive bowel movements,” according to the Centers for Disease Control and Prevention. These intestinal eruptions usually last about a week, but can last for two or more weeks, the CDC says, making dehydration one of the most significant concerns.
The parasite is shed in the faeces and spread through crop and water. Thorough washing and cleaning of produce before eating, along with strict hand hygiene, are key prevention methods.
State and national trends
MDHSS noted that previous outbreaks have been linked to bagged salad mixes/kits, cilantro, basil, raspberries, snow peas and green onions.
“At this time, no specific crop grower, supplier, or crop type has been identified as the source,” an MDHSS spokesperson told Ars. But the state is coordinating a major investigation to identify the source or sources, working with local health departments in the southeastern region of the state, where most cases have been reported. Officials conduct job interviews, share information, and eventually try to determine common exposures. The spokeswoman said MDHSS also coordinates with the CDC and shares state case data with the agency.
