On Jul. 22, 2026, The U.S. Food and Drug Administration (FDA) announced it is investigating a new outbreak of cyclosporiasis, with 72 cases ​tied to an as-yet-unidentified source. The FDA said it has initiated a traceback to identify the source of the latest ​outbreak.

Cyclosporiasis is an intestinal illness caused by the cyclospora parasite. People ​can become infected after eating or drinking contaminated food or water ⁠and symptoms can include diarrhea, stomach cramps, nausea and fatigue.

The CDC has identified 4,173 ​laboratory-confirmed, domestically acquired cyclosporiasis cases in the United States since May 1 and is ​investigating more than 7,400 additional reported infections that have yet to be laboratory confirmed, many of them in Michigan and Ohio. The figures come as Michigan has reported 7,171 cases so ​far this year, while Ohio has also recorded a sharp rise in infections.

Regulators ​have linked the broader spread in the Midwest, the largest foodborne illness outbreak in the ‌U.S. in ⁠recent years, to a Taylor Farms plant in Mexico. On July 17, Taylor Farms recalled iceberg lettuce sourced from central Mexico. The recall includes lettuce sold in retail stores, served in restaurants and distributed to food service customers.

However, Mexico said there was no evidence ​yet to suggest ⁠that lettuce sourced from it caused the outbreak in the U.S.