More than half of U.S. states—29 and counting—have now reported cases of a parasitic illness that can induce weeks of watery, explosive diarrhea since the wave first emerged in May. But this mysterious outbreak, a poop tsunami, as some might say, appears to have a new epicenter. Michigan, the Great Lakes state whose license plates have long advertised the nickname “Water Wonderland,” has now documented 992 cases of this prolific diarrhea-generating infection, according to the latest update from the Michigan Department of Health and Human Services (MDHHS). While the unpleasant gastrointestinal ordeal has not yet caused any deaths, cases of the bug have now climbed into the thousands—or about four times more than were recorded at this point last year, according to federal data from the Centers for Disease Control and Prevention. Michigan’s localized cluster of this punishing weeks-long diarrhea, which is believed to be caused by the foodborne parasite Cyclospora, appears to have crossed the border between the state’s southeastern counties and Ohio. As of this Wednesday, Lucas County, Ohio, has documented 306 further cases, with surrounding counties in northwestern Ohio reporting over 500 cases in total, according to the Associated Press.