Surveillance of Cyclosporiasis

July 16, 2025

Cyclosporiasis is caused by the microscopic parasite Cyclospora cayetanensis.
Cyclosporiasis is a nationally notifiable disease.
As of July 15, 2025, 244 cases of cyclosporiasis acquired in the United States had been reported to CDC.

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 C. cayetanensis cases.

Case counts usually rise in the spring and summer months. In 2025, cases were reported starting in May.

Symptoms of cyclosporiasis

If you have symptoms of cyclosporiasis, see your healthcare provider. They can test and treat you for cyclosporiasis. If your patient has a confirmed case of cyclosporiasis, report the case to your local health department.

2025 fast facts

Cases acquired in the United States: 244
Hospitalizations: 33
Deaths: 0
States that reported cases: 26

Current situation

As of July 15, 2025, 244 cases were in people who acquired cyclosporiasis in the United States. Cases were reported by 26 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 1 to 86 years, with a median age of 47, and 60% were female. The median illness onset date was June 16, 2025 (range: May 2 – July 9). Of 244 people with information available, 33 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 2025 cases acquired in the United States

This map shows where the 244 people with cyclosporiasis acquired in the United States since May 1, 2025, 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.

2025 Cyclosporiasis cases acquired outside of the United States

As of July 15, 2025, 240 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 range in age from 1 to 90 years, with a median age of 45, and 65% are female. The median illness onset date is June 9, 2025 (range: May 1 - July 8). Of 240 people with information available, 10 were hospitalized. No deaths have been reported.

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