Total case numbers have surpassed 11,500 reported cases across 41 states—but Michigan has by far been the hardest hit.

Nationwide, there are more than 18,000 confirmed or suspected cases of cyclosporiasis, the illness caused by a parasite found in human feces, the CDC said Tuesday.

Total case numbers have surpassed 11,500 reported cases across 41 states—but Michigan has by far been the hardest hit.