Michigan Cyclosporiasis Cases Top 10,000: Calhoun County Among Hardest Hit

The state of Michigan is facing one of its most significant foodborne illness outbreaks in recent memory. As of late July, cyclosporiasis cases have surpassed 10,077 confirmed infections across the state since June 22, according to the Michigan Department of Health and Human Services (MDHHS).

Calhoun County has been hit particularly hard, reporting 190 cases. This places our community among the most affected regions in West Michigan, trailing only Kalamazoo County with 153 cases in the immediate area.

What is Cyclosporiasis?

Cyclosporiasis is an intestinal illness caused by the microscopic parasite Cyclospora cayetanensis. People become infected after consuming food or water contaminated with the parasite. The most common culprit in outbreaks is fresh produce, particularly leafy greens and herbs.

Symptoms typically begin two days to two weeks after infection and include:

• Explosive diarrhea
• Nausea and vomiting
• Stomach cramps and bloating
• Fatigue
• Loss of appetite

The illness can last from a few days to more than a month if untreated. While rarely fatal, it can cause serious dehydration and prolonged discomfort.

West Michigan Case Breakdown

Here is how the outbreak has affected counties across West Michigan:

• Calhoun County: 190 cases
• Kalamazoo County: 153 cases
• Kent County: 98 cases
• Ottawa County: 93 cases
• Allegan County: 55 cases
• Van Buren County: 67 cases
• St. Joseph County: 18 cases
• Barry County: 12 cases
• Berrien County: 13 cases
• Branch County: 10 cases
• Cass County: 10 cases

Federal Response Under Scrutiny

During a hearing before the Senate Homeland Security and Governmental Affairs Committee, Senator Gary Peters (D-MI) pointed to federal staffing and funding cuts as a significant factor in the slowed response to the outbreak.

"Staffing and funding cuts have slowed the federal, state and local response to ongoing outbreak of a foodborne parasite, which has sickened thousands in my home state of Michigan, as well as across the country," Senator Peters stated.

The Centers for Disease Control and Prevention (CDC) and the Michigan Department of Health and Human Services continue investigating the source of the outbreak. Earlier reports have linked similar outbreaks to contaminated lettuce from suppliers including Taylor Farms.

What Residents Should Do

If you experience symptoms of cyclosporiasis, contact your healthcare provider immediately. The infection is treatable with prescription antibiotics.

To reduce your risk:

• Wash all fruits and vegetables thoroughly under running water
• Refrigerate produce promptly
• Avoid consuming food or water that may be contaminated
• Practice good hand hygiene

For the most up-to-date case numbers and information, visit the Michigan Department of Health and Human Services outbreak page.

Frequently Asked Questions

Q: How many cyclosporiasis cases are in Calhoun County?

A: Calhoun County has reported 190 confirmed cases as of late July 2026, making it one of the hardest-hit counties in West Michigan.

Q: What is causing the cyclosporiasis outbreak in Michigan?

A: The outbreak is caused by the Cyclospora parasite, typically spread through contaminated fresh produce like lettuce. Federal and state health agencies are investigating the specific source.

Q: What are the symptoms of cyclosporiasis?

A: Symptoms include explosive diarrhea, nausea, stomach cramps, bloating, fatigue, and loss of appetite. They typically appear 2 days to 2 weeks after infection and can last for weeks without treatment.