145 confirmed cyclosporiasis cases were reported from May 1 to June 16 across 17 states, and 20 people were hospitalized.
Doctors said the broader-than-usual outbreak is a reminder to wash fresh fruits and vegetables thoroughly, especially berries and leafy produce, before eating.
Cyclospora infections typically rise from May through August, and health officials are still investigating whether the cases share a common source.
Symptoms usually include cramping, abdominal discomfort and watery diarrhea; severe cases can cause weight loss and fatigue, though the illness is rarely fatal and is unlikely to spread person to person.