First US Deaths From the Cyclospora Outbreak Reported as Cases Top 18,000

Two Michigan residents with serious underlying health conditions have become the first reported fatalities linked to this year’s Cyclospora outbreak in the United States, as federal and state authorities continue investigating multiple sources of contamination

The first US deaths from the Cyclospora outbreak have been reported as the intestinal infection continues to spread across the country, causing thousands of cases of severe diarrhea during recent weeks.

Health officials in Michigan and the Centers for Disease Control and Prevention (CDC) said the two victims, both Michigan residents with significant underlying medical conditions, died in circumstances complicated by dehydration caused by the infection.

Michigan remains the state hardest hit by the outbreak, with 11,234 reported cases and 193 hospitalizations. Nationwide, the CDC has identified more than 18,000 cases during the current season. Of those, 6,707 have been laboratory confirmed, while another 11,500 remain under review to determine whether the infections were acquired within the United States.

State health officials emphasized that deaths linked to cyclosporiasis are uncommon because the infection is generally not considered a fatal disease.

The outbreak remains the focus of multiple investigations led by the Food and Drug Administration (FDA) and the CDC. One of the largest clusters, affecting nine Midwestern states, has been linked to iceberg lettuce imported from Mexico and distributed by Taylor Farms de Mexico. The products were voluntarily recalled on July 17.

Health authorities are urging consumers not to eat products covered by the recall while investigations continue to determine whether additional sources of contamination may be involved.

Cyclosporiasis is a foodborne and waterborne illness caused by the parasite Cyclospora cayetanensis. The infection typically causes prolonged diarrhea, abdominal cramps, nausea, weight loss, and fatigue. Although it is usually not life-threatening, it can become dangerous for vulnerable individuals because of severe dehydration.

Cases in the United States typically increase between May and August, but the 2026 outbreak is the largest ever recorded in the country.

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