The parasitic illness is spreading at an unprecedented pace. Explore the key statistics behind the surge in cases and the states most affected.

CDC confirms 4,173 U.S. Cyclospora cases as it investigates a lettuce-linked outbreak. More than 7,400 additional reports remain under review.

Cases of cyclosporiasis have topped 11,500 in 41 states, according to data from the Centers for Disease Control and Prevention on Wednesday.