Lansing, Michigan — Michigan health officials are continuing to investigate what could become the largest cyclosporiasis outbreak in U.S. history, as the number of confirmed infections has climbed to 6,148 cases, raising concerns about contaminated food and prompting a multi-state investigation.
According to the Michigan Department of Health and Human Services (MDHHS), the statewide case count increased by 1,146 infections in just three days, rising from 5,002 confirmed cases on July 17 to 6,148 cases as of July 20.
The rapidly growing outbreak has affected dozens of communities across the state, while investigators continue searching for the food source responsible for spreading the parasite.
Hospitalizations Continue to Rise
Health officials say the number of people requiring hospital care has also increased significantly.
As of July 16, 102 people had been hospitalized because of the illness, more than doubling the 44 hospitalizations reported just one week earlier.
The Michigan Department of Health and Human Services updates case numbers each weekday, while hospitalization figures are released weekly on Thursdays as officials continue monitoring the outbreak.
Although most people recover with appropriate treatment, severe cases can require hospitalization, particularly among older adults or individuals with weakened immune systems.
Outbreak Spreads Across 55 Michigan Counties
The outbreak first came to the attention of state and local health officials in late June, when an unusual cluster of illnesses was detected in Monroe County.
Since then, infections have spread rapidly across 55 Michigan counties, making it one of the state’s largest foodborne illness investigations in recent years.
Wayne County has reported more than 300 cases, while Monroe, Washtenaw, Livingston, Oakland and Lenawee counties have each recorded more than 100 infections.
For comparison, Michigan typically reports only around 50 cases of cyclosporiasis in an entire year, highlighting just how unusual the current outbreak has become.
Officials also confirmed that 34 states are now investigating reports of the illness, raising concerns that the outbreak could extend well beyond Michigan.
Investigators Continue Searching for the Source
Earlier this month, health officials announced that preliminary testing suggested lettuce or salad greens could be connected to the outbreak.
Investigators have since focused on identifying the supplier responsible for the potentially contaminated produce. However, the investigation remains unresolved.
The U.S. Food and Drug Administration (FDA) said that a lettuce sample from Taylor Farms that initially tested positive for Cyclospora was later determined to be a false positive, eliminating one possible lead and leaving investigators searching for another source.
Officials continue urging consumers to follow food safety recommendations while the investigation remains active.
What Is Cyclosporiasis?
Cyclosporiasis is an intestinal illness caused by the parasite Cyclospora cayetanensis, which spreads when food or water becomes contaminated with infected fecal matter.
Symptoms usually begin about one week after exposure and commonly include watery diarrhea, nausea, loss of appetite, bloating, stomach cramps and fatigue.
The illness may last from several days to two weeks or longer, and some patients can experience recurring symptoms if left untreated.
Health officials advise anyone experiencing persistent gastrointestinal symptoms after eating fresh produce to contact a healthcare provider, especially as the investigation continues.
Have you or someone you know been affected by this outbreak? Do you think stronger food safety measures are needed to prevent incidents like this? Share your thoughts respectfully in the comments below.
