Fresno County confirms one cyclosporiasis case, not linked to outbreak

Fresno County Department of Public Health confirmed one case of cyclosporiasis in the county. It is not connected to outbreaks elsewhere in the country. It is the only cyclosporiasis case in Fresno County so far this year and the only one in 2026.

California is not among the states currently seeing an increase in cyclosporiasis cases. The California Department of Public Health counted 41 provisional cases from January through June 2026, down from 80 during the same period in 2025.

The Centers for Disease Control and Prevention is tracking a 2026 outbreak with an unknown source and epidemiologically linked cases in Michigan, Ohio, Kentucky and West Virginia.

Cyclosporiasis is a foodborne intestinal infection that usually starts about a week after exposure, though symptoms can begin anywhere from 1 to 20 days later. The symptoms to watch for include watery diarrhea, stomach cramps, nausea and fatigue. Older adults, young children and people with weakened immune systems face a greater risk of dehydration and other complications.

Public health investigators often cannot connect every case to a single outbreak because they rely on questionnaires to interview sick people and reconstruct likely exposures. In Fresno County, health workers are continuing local monitoring to determine whether a food source, travel history or another exposure explains how the person got sick. Fresno County residents who develop persistent watery diarrhea or other cyclosporiasis symptoms should seek medical care, especially if they are in a higher-risk group.