Cyclosporiasis diagnoses reach historic levels in 2026 summer outbreak

During July 2026, the rate of cyclosporiasis diagnosis reached 10.5 per 100,000 people with a healthcare encounter, more than 11-fold higher than the average July rate observed between 2018 and 2025 (0.9 per 100,000). More than 1 in 5 patients with a cyclosporiasis diagnosis (22.0%) had an emergency department visit within two weeks of diagnosis. Nearly 1 in 8 patients (11.9%) were hospitalized, and hospitalization was almost twice as common among adults aged 65 years or older (19.4%) compared with patients under 65 years old (9.9%).