In Michigan, health officials have reported a significant outbreak of cyclosporiasis, an intestinal illness caused by a parasite. As of July 6, 2026, there have been at least 992 confirmed cases since June 22, with 36 individuals hospitalized. This number is alarmingly high compared to the typical annual average of about 50 cases, indicating that the current outbreak is nearly 20 times greater than usual. The Michigan Department of Health and Human Services (MDHHS) is investigating the outbreak, with a working hypothesis suggesting that it may be linked to contaminated produce.
The Centers for Disease Control and Prevention (CDC) notes that cyclosporiasis is primarily spread through food or water contaminated with feces. Past foodborne outbreaks have been associated with various types of imported fresh produce, including raspberries, basil, snow peas, mesclun lettuce, and cilantro. However, as of now, no specific source, grower, or type of produce has been identified as the cause of the current outbreak in Michigan.
In addition to Michigan, neighboring Ohio has reported 177 cases, and the CDC has confirmed 145 cases across 17 states since May 1, excluding Michigan. The ages of patients range from 5 to 86 years, with 61% being female. While some individuals may not exhibit symptoms, those who do often experience explosive watery diarrhea, cramping, bloating, low-grade fever, nausea, and vomiting. The CDC indicates that symptoms typically appear one week after infection, but this can vary from two days to two weeks.
Due to the similarity of cyclosporiasis symptoms to other gastrointestinal illnesses, it can be challenging for patients to identify the cause of their condition. Health officials are urging anyone experiencing gastrointestinal symptoms, particularly sudden and ongoing diarrhea, to contact their healthcare provider and local health department for guidance. The situation remains under close observation as health officials work to identify the source of the outbreak and mitigate its spread.
