Michigan alone has reported more than 700 cases of cyclosporiasis, often linked to fresh produce. Why haven't we found the cause?

Cases of cyclosporiasis, a parasitic foodborne illness that can cause "explosive" diarrhea, are being reported across the United States, including in Rhode Island.

The outbreak spans more than a dozen states, and is particularly troublesome in Michigan, where nearly 1,000 people have been diagnosed in a two-week period.