Eruption Michigan sees explosive outbreak of diarrheal parasite with over 700 cases Cases have risen quickly as officials are working to identify a common source. Beth Mole – Jul 7, 2026 6:29 pm | 151 This photomicrograph of a fresh stool sample revealed the presence of four Cyclospora cayetanensis oocysts in the field of view. Credit: CDC | Melanie Moser This photomicrograph of a fresh stool sample revealed the presence of four Cyclospora cayetanensis oocysts in the field of view. Credit: CDC | Melanie Moser Text settings Story text Size Small Standard Large Width * Standard Wide Links Standard Orange * Subscribers only Learn more Minimize to nav Cases of a diarrhea-causing intestinal parasite have exploded in Michigan over the last two weeks in an outbreak that still has no clear source. As of July 6, the state has received reports of over 700 cases since June 22, along with 36 hospitalizations, the Michigan Department of Health and Human Services (MDHSS) told Ars Technica on Tuesday. On June 30, the health department reported 170 cases , which rose to 572 on July 4 .
The microscopic unicellular parasite Cyclospora cayetanensis is behind the cases, causing a 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 go on for two or more weeks, the CDC says, with dehydration being one of the most significant concerns. The parasite is shed in feces and spreads by getting on produce and into water.
Source: https://arstechnica.com/health/2026/07/michigan-sees-explosive-outbreak-of-diarrheal-parasite-with-over-700-cases/
The microscopic unicellular parasite Cyclospora cayetanensis is behind the cases, causing a 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 go on for two or more weeks, the CDC says, with dehydration being one of the most significant concerns. The parasite is shed in feces and spreads by getting on produce and into water.
Source: https://arstechnica.com/health/2026/07/michigan-sees-explosive-outbreak-of-diarrheal-parasite-with-over-700-cases/