Surge in Cyclosporiasis Cases Across U.S. Prompts Public Health Response

Cyclosporiasis Cases Climb in 2026: CDC and States Report Widespread Outbreak

The United States is confronting a sharp increase in cyclosporiasis cases this summer, according to the latest surveillance data from the Centers for Disease Control and Prevention (CDC). As of July 9, 2026, the CDC has confirmed 843 domestic cases of the intestinal illness across 31 states, with 86 hospitalizations and no reported deaths. An additional 343 travel-associated cases have been identified in 32 states.

However, state health departments are reporting even higher numbers, with Michigan alone documenting 1,562 cases, New York 470, Ohio 364, and North Carolina 205, among others. Also, more states including, Oregon and Washington are currently testing to confirm possible cases.

Cyclosporiasis is caused by the microscopic parasite Cyclospora cayetanensis, which infects the small intestine and leads to gastrointestinal symptoms. The illness is primarily spread through consumption of food or water contaminated with feces containing the parasite. Outbreaks in the U.S. have historically been linked to fresh produce, but as of mid-2026, no specific food source has been confirmed in the ongoing investigations.

According to the CDC, the current outbreak has effected individuals ranging in age from 5 to 88, and more than half are female (59%). 

What is Cyclosporiasis?

Cyclosporiasis is a nationally notifiable disease in the United States. The most common symptom is persistent watery 'often explosive' diarrhea, which can be frequent and severe. Other symptoms may include loss of appetite, weight loss, stomach cramps, bloating, increased gas, nausea, fatigue, and, less commonly, vomiting or low-grade fever. Symptoms typically begin about one week after exposure and can last from a few days to over a month if untreated. Some individuals may experience relapses.

The recommended treatment is the antibiotic combination trimethoprim-sulfamethoxazole (TMP-SMX). Most healthy people recover without treatment, but the illness can be prolonged and more severe in those with weakened immune systems. There is currently no vaccine for cyclosporiasis.

Outbreak Scope and Surveillance

The CDC’s official count of 843 confirmed domestic cases reflects only laboratory-confirmed reports and does not include probable cases or those still under investigation. Due to a typical six-week lag between illness onset and case reporting, actual case numbers are expected to rise as more data are processed. State-level surveillance indicates that the true burden is likely much higher, with Michigan, New York, Ohio, and North Carolina among the hardest-hit states this season.

No deaths have been reported in connection with the 2026 outbreak, and hospitalizations remain relatively low compared to the number of cases. The CDC, in collaboration with the Food and Drug Administration (FDA) and state health departments, is actively investigating several multi-state clusters, but no single food item, grower, or supplier has been identified as the source.

Transmission and Prevention

Cyclospora is typically transmitted when people ingest food or water contaminated with feces containing the parasite. In the U.S., outbreaks have most often been linked to fresh produce such as bagged salads, basil, and berries. Washing produce may reduce risk but is not always effective, as the parasite can be resistant to routine disinfection methods.

To reduce the risk of cyclosporiasis:

• Follow food safety guidelines for washing and preparing fresh produce.
• Avoid consuming food or water that may be contaminated, especially when traveling to tropical or subtropical regions.
• Seek medical attention if you experience persistent or severe gastrointestinal symptoms.

For more information on cyclosporiasis, visit the CDC’s cyclosporiasis surveillance page and the FDA’s food safety alerts.

Public Health Response and Ongoing Investigation

The CDC and FDA continue to monitor the situation and update guidance as new information becomes available. Public health officials emphasize that the source of the current outbreak remains under investigation, and consumers should stay informed about potential recalls or safety alerts.

For the latest updates, visit GovOneStop.com/news.
Explore current active public safety alerts at GovOneStop.com/active-alerts.

Summary Table: Key 2026 Cyclosporiasis Outbreak Data

Stay Informed

Cyclosporiasis remains a significant public health concern this summer. While the illness is rarely life-threatening, it can cause substantial discomfort and disruption. Public health authorities urge the public to remain vigilant, practice safe food handling, and stay updated as investigations continue.

For more information and updates:

• CDC Cyclosporiasis Surveillance
• FDA Cyclospora Food Safety Alerts
• GovOneStop.com/news