Cyclosporiasis Outbreak Causes 'Explosive' Diarrhea in US

Cases of cyclosporiasis, a parasitic illness known for causing "explosive," watery diarrhea, have surged across the United States, with health officials reporting an unusually large outbreak. As of July 2, 2026, Michigan has documented nearly 1,000 cases, a significant increase from its typical annual average of approximately 50 cases. This makes the current situation the largest outbreak in Michigan's history and one of the most substantial nationwide in recent years. The Centers for Disease Control and Prevention (CDC) is investigating the outbreak, which has also seen a sharp rise in other states. Ohio, for instance, reported 177 cases by July 2, according to the CDC's latest count. The parasitic infection is typically contracted through the consumption of contaminated food or water. While cyclosporiasis is rarely life-threatening, it can lead to severe gastrointestinal distress. Health authorities are working to identify the source of the contamination to prevent further spread. The CDC has confirmed cases in 18 US states, highlighting the widespread nature of this public health concern. Further details on the specific food items or water sources implicated are expected as the investigation progresses. The CDC's involvement underscores the seriousness of the outbreak and the need for public awareness regarding symptoms and prevention.