CDC Warns of Rising Parasite Infections With Explosive Diarrhea

The U.S. Centers for Disease Control and Prevention (CDC) is warning of a significant increase in cyclosporiasis cases, a parasitic infection characterized by "explosive" diarrhea. As of Monday, July 6, 2026, Michigan has confirmed 678 cases, a stark rise from its typical annual total of 50. Ohio has reported an additional 177 cases as of July 2, 2026. These numbers represent a broader trend of increasing infections across multiple states since May 2026. Prior to this Midwest outbreak, 145 cases were documented in 17 states between May 1 and June 16, 2026, with New York, Texas, and Illinois reporting the majority.

At least 20 individuals have been hospitalized due to the infection, though no fatalities have been reported, according to the CDC. Cyclosporiasis is an intestinal illness caused by the parasite Cyclospora, which spreads through contaminated food or water containing feces. While generally not life-threatening, the infection can lead to severe symptoms. The CDC states that common symptoms include watery diarrhea with frequent and sometimes "explosive" bowel movements, loss of appetite, weight loss, cramping, bloating, increased gas, nausea, fatigue, and less commonly, vomiting, body aches, headache, and low-grade fever.

If left untreated, cyclosporiasis can persist for weeks, with gastrointestinal symptoms potentially fading while fatigue lingers. The Michigan Department of Health and Human Services (MDHHS) is actively tracking the outbreak in the Wolverine State, with reports indicating that the case count is a "moving target" and expected to rise. The CDC's ongoing surveillance highlights the importance of public awareness regarding food and water safety to prevent further transmission of this parasitic illness.