Summary (tl;dr)

The United States is currently experiencing a widespread outbreak of cyclosporiasis, an intestinal illness caused by a parasite, with over 800 confirmed cases and more than 1,500 suspected cases across 31 states since May 1, 2026, primarily linked to contaminated fresh produce.

Essential Background

Cyclosporiasis is an intestinal illness caused by the microscopic parasite Cyclospora cayetanensis. People typically contract the infection by consuming food or water contaminated with human feces containing the parasite. The illness is seasonal in the U.S., with outbreaks most often occurring during the warmer summer months between May and August. Symptoms, which can appear days to weeks after exposure, commonly include prolonged, watery, and sometimes "explosive" diarrhea, along with other gastrointestinal issues like abdominal cramps, nausea, fatigue, and loss of appetite.

The Full Story

Health officials, including the U.S. Centers for Disease Control and Prevention (CDC) and various state health departments, are actively investigating a significant surge in cyclosporiasis cases across the country. As of July 9, 2026, the CDC reported 843 confirmed domestically acquired cases and is analyzing over 1,500 additional suspected cases. More than 80 hospitalizations have been reported, although no deaths have occurred in connection with this outbreak. While the specific food source responsible for the current multi-state outbreak has not yet been definitively identified, past outbreaks have frequently been linked to contaminated fresh produce such as lettuce, basil, cilantro, raspberries, and snow peas. Michigan has emerged as a primary hotspot, reporting over 1,500 cases, a significant increase from its typical annual average of around 50 cases. Other states like Ohio, New York, North Carolina, and Florida are also reporting elevated case counts.

Why It Matters

This widespread outbreak is a significant public health concern, as the illness, while rarely fatal, can cause severe and prolonged gastrointestinal discomfort, sometimes lasting for weeks or even months if untreated. The difficulty in identifying the exact contaminated food source makes it challenging for consumers to avoid exposure, prompting health officials to advise extra precautions when handling and preparing fresh produce. This trend highlights the ongoing importance of food safety practices and the vigilance of public health surveillance to prevent and control foodborne parasitic infections.

Geographic Location

• United States (nationwide outbreak across 31 states)
• Michigan, United States (over 1,500 cases reported, primary hotspot for the outbreak)
• Lucas County, Ohio, United States (over 300 cases reported)
• Ohio, United States (hundreds of cases reported)
• New York, United States (394 cases reported)
• North Carolina, United States (205 cases reported)
• Illinois, United States (141 cases reported)
• Miami-Dade County, Florida, United States (9 cases reported)
• Lee County, Florida, United States (11 cases reported)
• Florida, United States (60 cases reported statewide)
• Texas, United States (48 cases reported)
• West Virginia, United States (47 cases reported)