Samantha Sayles, Senior Digital Producer
Published:
Samantha Sayles, Senior Digital Producer
Over 300 cases of cyclosporiasis have been reported within a week in Southeast Michigan, and Michigan health officials are investigating.
The Michigan Department of Health and Human Services (MDHHS) and Michigan Department of Agriculture and Rural Development (MDARD) are actively investigating the potential source of the “large and growing outbreak” of cases confirmed in Monroe, Lenawee, Washtenaw, Wayne, Shiawassee, Jackson and Livingston counties.
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Health officials also reported 24 cases across 11 other Michigan counties, including in the city of Detroit. Typically, Michigan only gets around 50 cases per year.
On July 1, MDHHS reported there were at least 170 cases. On Thursday, the number of cases jumped to at least 300.
Read more –> Michigan health officials warn of ‘large and growing outbreak’ of cyclosporiasis
The age range of individuals who were diagnosed with the illness ranges from 8 years old to 84 years old, with a median age of 41, according to MDHHS.
Health officials are working to determine the common exposure of the outbreak in Michigan.
Here’s what to know about cyclosporiasis:
Cyclosporiasis is an intestinal illness caused by a parasite and infects the small intestine.
Healthcare providers can diagnose the illness by testing a stool sample.
If infected with cyclosporiasis, people may experience watery diarrhea with frequent and sometimes explosive bowel movements.
The illness can last from a few days to over a month if the illness is not treated. Symptoms could relapse.
The timeframe from becoming infected to becoming sick usually takes about one week but can range from two days to two weeks or more.
In the US, outbreaks of cyclosporiasis have been linked to various types of fresh produce. People can get infected with Cyclospora more than once.
Anyone who experiences symptoms of cyclosporiasis should see their healthcare provider.
The illness can spread when people eat food or drink water that was contaminated with feces.
The CDC said it can take at least one or two weeks outside the body for Cyclospora to become infectious after passing in a bowel movement, making direct person-to-person transmission unlikely.
According to the CDC, people can prevent infection by avoiding food or water that may contain feces and by following food safety recommendations for safe preparation and storage.
The CDC recommends washing hands with soap and water before and after handling or preparing raw fruits and vegetables.
Wash all fruits and vegetables thoroughly under running water before eating, cutting or cooking. Cut away any damaged or bruised areas on fruits and vegetables before preparing and eating.
Read more on prevention here.
Copyright 2026 by WDIV ClickOnDetroit – All rights reserved.
Samantha Sayles is an Oakland University alumna who’s been writing Michigan news since 2022. Before joining the ClickOnDetroit team, she wrote stories for WILX in Lansing and WEYI in Flint.
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