Two Hawaii residents from the same household were confirmed with cyclosporiasis after traveling internationally and to the U.S. mainland, lifting the state's 2026 case count to three.
Travel history, symptom timing and the parasite's incubation period led investigators to conclude the infections were acquired outside Hawaii, with no evidence of local spread.
The first 2026 case involved a nonresident visitor who also contracted the illness elsewhere, and state epidemiologists said the public risk in Hawaii remains low.
Cyclospora infections usually stem from contaminated food or water—often fresh produce in U.S. outbreaks—and can cause watery diarrhea for weeks without treatment, though prescription antibiotics are effective.