The tally of infections tied to an explosive diarrhea-causing parasite that’s spreading across the U.S. just jumped again. Michigan remains the hardest-hit state, reporting 1,251 cases and 44 hospitalizations on Thursday. That total is up from just 700 earlier this week. There are also nearly 400 cases in New York, according to New York City’s local station WNBC. Both Ohio and North Carolina also reported around 200 cases in each state. However, the total figure of people across the U.S. who are ill is likely significantly higher from states not reporting their data or people who didn’t seek out treatment.Infections can lead to flu-like illness, as well as uncomfortable gastrointestinal symptoms that send some patients to the hospital.But while cases have continued to climb, investigators