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US cyclosporiasis cases top 4,100 as CDC investigates lettuce-linked outbreak

By Thomson Reuters Jul 21, 2026 | 6:17 PM

July 21 (Reuters) – The Centers for Disease Control and Prevention has pegged the number of domestically acquired, lab-confirmed U.S. cyclosporiasis cases since May 1 at 4,173 ​after federal and state officials examined outbreaks including ‌a multistate one linked to lettuce.

Here are some details:

• The CDC said on Tuesday it is also aware of more than 7,400 additional reported cases that have not yet been laboratory confirmed and require ‌further ​investigation. Many of the additional cases ⁠have been reported by Michigan ⁠and Ohio.

• The CDC said 308 people with confirmed domestically acquired infections have been hospitalized. Cases have been reported in 41 states, with no deaths.

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

• The CDC, the ​U.S. Food and Drug Administration and state health officials are ​investigating an outbreak in five states linked to iceberg ‌lettuce.

• 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.

• The CDC said the number of confirmed cases is likely to increase due to reporting delays between the onset of illness ⁠and federal health ‌officials being notified.

• People with confirmed domestically ⁠acquired infections range from age 2 to ​95, ‌with a median age of 44, and 56% ​female. The ⁠median illness onset date was June 26.

• The CDC also reported 767 travel-linked cases since May 1, with 33 hospitalizations and no deaths tied to contaminated food or water consumed outside the United States.

(Reporting by Padmanabhan Ananthan in Bengaluru; Editing ​by Pooja Desai)