Surveillance of Cyclosporiasis

Overview

Cyclosporiasis is a nationally notifiable disease and is reportable in 47 states, the District of Columbia, and New York City. Even if it is not reportable in a state, it is important for healthcare providers and the public to inform local health departments about potential cases and clusters of the disease so that they can take appropriate action to prevent additional cases.

Surveillance

CDC, along with state and federal health and regulatory officials, monitor cases of cyclosporiasis year-round to detect outbreaks linked to a common food source in the United States. This aids in swiftly identifying and investigating outbreaks in the United States. Cyclosporiasis also can be acquired when people eat or drink contaminated food or water during travel outside the United States. CDC and other agencies are working to further develop and validate molecular-level tools for linking Cyclospora cases.

Case counts rise during the spring and summer months; therefore, the cyclosporiasis season is considered May 1 through August 31. Clusters of cyclosporiasis cases have been detected outside this range in some years. In 2026, outbreak season began on May 1.

2026 fast facts

• Cases acquired in the United States: 145
• Hospitalizations: 20
• Deaths: 0
• States reporting cases: 17
  

Current situation

As of June 16, 2026, 145 cases were reported in people who acquired cyclosporiasis in the United States. Cases were reported by 17 states. These people became sick after eating food in the United States and did not report any travel during the 14 days before they got sick.

Sick people ranged in age from 5 to 86 years, with a median age of 42, and 61% were female. The median illness onset date was May 13, 2026 (range: May 1 – June 6). Of 145 people with information available, 20 were hospitalized. No deaths have been reported.

Local, state, and federal (CDC, FDA) public health authorities are investigating several clusters of cases in more than one state. Investigations to identify potential sources are ongoing.

Location of 2026 cases acquired in the United States

This map shows where the 145 people with cyclosporiasis acquired in the United States since May 1, 2026, lived. Cyclosporiasis cases may not be limited to these states with known cases. The true number of people sick with cyclosporiasis was likely higher than the number reported. This is because some people recover without medical care and are not tested for Cyclospora.

*These data include case data reported directly to the Cyclospora surveillance program at CDC. Case counts may not match exactly with what is listed in the Nationally Notifiable Diseases Surveillance System tables. New York State includes case reports from New York City. In Pennsylvania, cases are reported voluntarily. Data are preliminary and subject to change. For questions related to the number of cases reported in each state, contact that state's health department.

2026 Cyclosporiasis cases acquired outside of the United States

As of June 16, 2026, 45 cases were in people who ate or drank food or water that made them sick while they were traveling outside the United States during the 14 days before they got sick. Sick people ranged in age from 17 to 89 years, with a median age of 43, and 62% were female. The median illness onset date was May 19, 2026 (range: May 1 – June 7). Of 45 people with information available, 3 were hospitalized. No deaths have been reported.

Resources

• Reporting a Foodborne Disease Outbreak (general public)
• Report a Problem with Food
• Cyclosporiasis National Hypothesis Generating Questionnaire
• FDOSS Home | Foodborne Disease Outbreak Surveillance System (FDOSS)| CDC
• Common Edible Peas in the United States (cdc.gov)
• Foodborne Outbreak Surveillance Data
• Food and Water Precautions for Travelers | Yellow Book | CDC