Cyclosporiasis is a diarrhea-causing infection from the parasite Cyclospira. It is spread through contaminated food and water. While we typically see cases spike during the summer months, the CDC's National Notifiable Diseases Surveillance System (NNDSS) is reporting almost 2,000 cumulative cases this year, making it the largest outbreak of reported cases. In comparison, the U.S typically saw about half as many cases by this time in previous years.
Cyclosporiasis is a nationally notifiable disease and is mandated to be reported in 47 states, but the exact total number of cases is difficult to pin down for several reasons. Local health departments are responsible for tracking and reporting case counts to states, which then report to the CDC. Additionally, not everyone with diarrhea seeks medical care, most people with diarrhea are not tested for cyclosporiasis, and diarrhea has many causes beyond cyclosporiasis, which complicates case tracking This dashboard tracks reported cases, combining CDC's NNDSS data with additional data at the county level from three states: Florida, Michigan, and Ohio. Data reflected below are current as of Jul 15, 2026.
Note: State data are the authoritative source for case reporting. NNDSS data may lag or differ due to submission timing variations.
Trends over time
National total shown by default; use the dropdown to switch to a specific state.
About this chart
Map shows cumulative cyclosporiasis cases reported to NNDSS for selected year. 2026 data are preliminary and incomplete. Not all states mandate cyclosporiasis reporting; states with zero cases may lack reporting requirements rather than having no cases. Territories are excluded. Standardized data can be found on our GitHub. The raw NNDSS data from CDC are found here.
Geographic distribution
Cases by state
2026 trends shown by default; use the slider to switch to an earlier year.
States shown as missing (unfilled) have reported zero cyclosporiasis cases to NNDSS in every year from 2022 onward.
About this chart
Map shows cumulative cyclosporiasis cases reported to NNDSS by state for selected year. 2026 data are preliminary and incomplete. Not all states mandate cyclosporiasis reporting; states with zero cases may lack reporting requirements rather than having no cases. Territories are excluded. Standardized data can be found on our GitHub. The CDC presents its NNDSS data here.
As noted above, data from NNDSS for this year may not be the most up-to-date. Below are totals reported by states for 2026:
| State | Number of cases | Cases per 100,000 | Last updated |
|---|---|---|---|
| Michigan* | 2,630 | 26.1 | Jul 13, 2026 |
| Ohio | 366 | 3.1 | Jul 11, 2026 |
| Florida | 62 | 0.3 | Jul 04, 2026 |
*Michigan's count reflects cases reported since July 1, 2026, not a full-year total.
MI, OH, and FL: county-level detail
These three states display case counts at the county level collected from state health departments. Hover over a county to see its case count. Most states only report cases at the state level. Oregon also reports at the county level, but its data are suppressed due to small sample sizes because Oregon is not currently experiencing a large outbreak.
About these charts
Cyclosporiasis cases are obtained from individual state health departments. Rates are calculated using county-specific population denominators from the 2021 census. Standardized data can be found on our GitHub. Raw data from FL are found here; raw data from MI are found here; and raw data from OH are found here.
Epic Health Alerts: elevated cyclosporiasis detected
Epic Health Alerts has identified Michigan and Ohio as currently experiencing elevated rates of cyclosporiasis, with cases significantly above historical levels for this time of year. Data are current through July 14, 2026.
| State | Location | Estimated Onset | Cases per 100k (Latest Week) |
|---|---|---|---|
| Michigan | State-Wide | 6/22/2026 | 12.8* |
| Ohio | State-Wide | 6/22/2026 | 18.8* |
Stay Updated
These numbers are preliminary and subject to change as more data arrive. Visit the Epic Health Alerts dashboard regularly for the latest information.
How alerts are triggered
Health Alerts are generated based on analysis in Epic Cosmos, based on data from Epic Cosmos participating organizations. They do not reflect complete case counts for a condition but rather evaluate population level trends of disease activity. The data can be viewed at https://www.epicresearch.org/health-alerts/.
Epic Health Alerts flag conditions when three criteria are met:
1. Current rates exceed those from the same period last year
2. The proportion of affected patients shows accelerating growth
3. The increase is statistically significant compared to the prior three years
See more in Epic Health Alerts' methodology section.