Vegetables and lettuces at a grocery store in Michigan. Michigan health officials say lettuces and salad greens are emerging as a likely source in the nationwide cyclosporiasis outbreak, which has sickened thousands of people across the country. (Photo by Jon King/Michigan Advance)Michigan has documented 8,176 cases of cyclosporiasis, according to the Department of Health and Human Services, marking a significant increase from the 5,002 cases it…