Cyclosporiasis outbreak: Officials identify leading suspected source of 'explosive' diarrhea parasit

Michigan health officials believe lettuce and salad greens are the leading suspected source of the state's growing cyclosporiasis outbreak, although the investigation remains ongoing.

The Michigan Department of Health and Human Services reported 2,640 confirmed cases as of Monday, July 13, far above the state's typical 40 to 50 cases each year, WTOL reported.

Health officials said no specific brand, grower or supplier has been identified, but interviews with more than 1,000 infected individuals have repeatedly pointed to lettuce as a common food exposure. Other foods have not been ruled out.

"Although we do not have a definite product identified as the source of the outbreak, we want to let Michiganders know what we have learned so far so they can take steps to protect their families," said Dr. Natasha Bagdasarian, the state's chief medical executive.

As a precaution, the health department recommended buying whole heads of lettuce instead of pre-washed bagged salads, discarding the outer two to three leaves, washing the remaining leaves under running water and cooking leafy greens when possible. Officials noted that heating food to 158 degrees Fahrenheit (70 degrees Celsius) kills the Cyclospora parasite.

Cyclosporiasis is a foodborne illness caused by the parasite Cyclospora cayetanensis. It commonly causes watery diarrhea, nausea and stomach cramps and is typically linked to contaminated food or water.

Health officials emphasized there is no evidence linking the outbreak to swimming or recreational water and that foodborne exposure remains the primary focus of the investigation.