A parasitic infection has sickened at least 300 people across 18 U.S. states, with the highest number of cases reported in Michigan [1].
The outbreak is concerning because the Centers for Disease Control and Prevention (CDC) has not yet identified the specific food or water source responsible for the spread [4, 5].
The illness, known as cyclosporiasis, is caused by the Cyclospora parasite. It typically produces symptoms of explosive diarrhea that can last for up to a month [1, 2].
Health officials have tracked the spread of the parasite to nearly two dozen states. While isolated cases have appeared in Wisconsin, where reports indicate between one and 10 cases [6], the largest clusters remain concentrated in the Midwest [6].
Reporting on the scale of the outbreak in Michigan varies by source. NBC News reported 170 cases [5], while TechTimes reported 300 cases [4]. A more recent report from MSN said that Michigan had 572 cases through July 4 [6].
Nationwide, the severity of the infection has led to at least 20 hospitalizations [5]. CDC investigators suspect the parasite was transmitted through contaminated food or water, but they have not named a specific product or producer [4, 5].
Public health officials continue to monitor the situation as they attempt to pinpoint the contamination source to prevent further infections.
“Symptoms of explosive diarrhea can last for up to a month.”
The wide geographic distribution across 18 states suggests the contaminated product was likely distributed through a large-scale commercial supply chain rather than a local source. Because cyclosporiasis has a prolonged incubation period and symptoms can persist for weeks, the total number of cases may continue to rise as more people seek medical attention.
