Surveillance of Cyclosporiasis | Cyclosporiasis | CDC

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Surveillance of Cyclosporiasis

For Public Health

July 10, 2026

Key points

CDC is aware that states are likely to report higher case counts of cyclosporiasis than reflected in CDC data and is working closely with states to update numbers as additional cases are confirmed. Since May 1, 2026, CDC has received reports of 843 confirmed domestic cases of cyclosporiasis and is aware of more than 1,500 cases that require further analysis to confirm the illness as domestically acquired cyclosporiasis. So far this year, multiple states have reported an increase in cases in the last two weeks compared to the same period in 2025.

State and federal partners are working together to investigate several outbreaks of cyclosporiasis. Investigations to identify source(s) of illness are ongoing.

Cyclosporiasis is a gastrointestinal disease caused by the microscopic parasite Cyclospora.

On a regular basis, CDC reports all laboratory-confirmed cases that are received from states. State data may include both probable and confirmed cases, which in turn is likely to reflect a higher case count than the CDC surveillance data because initial case reports have not yet been reported to CDC. CDC does not report probable cases.

2026 fast facts

As of July 9, 2026:

U.S. cases reported to CDC: 843

Hospitalizations: 86

Deaths: 0

States reporting cases: 31

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.

For Everyone<br>Preventing Cyclosporiasis

Surveillance

Data updates

Given the recent increase in cyclosporiasis cases, CDC will publish updated data more frequently than in previous seasons.

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 cyclosporiasis 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, the outbreak season began on May 1.

Symptoms of cyclosporiasis

See your healthcare provider if you have symptoms of cyclosporiasis, which can include watery diarrhea, loss of appetite, and weight loss. Your provider can test and treat you for cyclosporiasis. Healthcare providers: If your patient has a confirmed case of cyclosporiasis, report the case to your local health department.

Current situation

As of July 9, 2026, 843 cases were reported in people who acquired cyclosporiasis in the United States. Cases were reported by 31 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 88 years, with a median age of 44, and 59% were female. The median illness onset date was June 18, 2026 (range: May 1 – July 5). Of 843 people with information available, 86 were hospitalized. No deaths have been reported.

Multiple jurisdictions have reported an increase of cases in the last two weeks compared to the same period in 2025. We assume a 6-week reporting lag between illness onset and case reporting to CDC; therefore, we anticipate that case counts will continue to rise as data are received.

CDC teams are working diligently to collect, analyze, and provide data at the national level. State health departments may have more timely information about the situation in their jurisdictions.

Local, state, and federal (CDC, FDA) public health authorities are investigating several clusters of cases in more than one state. The numbers reported on this page reflect a total surveillance count of cases across the United States, including clusters of cases currently under traceback investigation by FDA and cases that have not been linked to a common source. Investigations to identify potential sources are...