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Infectious Disease Outbreaks

Infectious Disease Outbreaks

This page provides information on current and recent infectious disease outbreaks in Michigan, including case counts, outbreak updates, and resources for the public and health care providers. 

Cyclosporiasis Outbreak 

MDHHS is investigating an outbreak of cyclosporiasis in Michigan. While the investigation is ongoing, available information indicates that lettuce or salad greens may be a potential source of this outbreak. However, other food items cannot be completely ruled out. No specific type of produce, grower, or supplier has been identified as the source. 
 
MDHHS continues to work with local health departments and partners to investigate cases and provide updates as more information becomes available.

Michigan Case Counts

Total Cases: 14,718
Hospitalizations: As of September 3, 2026, 366 reported cases indicated they had been hospitalized.
Deaths: 2

Two deaths have been identified as part of the cyclosporiasis outbreak affecting Michigan. According to medical records, both individuals had significant underlying health conditions that may have been impacted by cyclosporiasis and dehydration. The two Michigan cases became ill prior to the voluntary recall of iceberg lettuce announced by U.S Food and Drug Administration on July 17.

No additional information will be provided on these two cases.

Cyclosporiasis is generally not a life-threatening illness. Death resulting from cyclosporiasis is uncommon in the United States.

Last updated: September 6, 2026

Data notes

  • Case counts reflect all cases of cyclosporiasis reported during the outbreak investigation period and may change as additional information becomes available.
  • Case counts reflect data reported through 9:30 a.m. Eastern Time.
  • Total case counts, hospitalization status and detailed outbreak data are updated on the first Thursday of each month by 12:00 p.m. Eastern Time.

 

National cyclosporiasis case count information is available from CDC: Cyclosporiasis Surveillance.

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Detailed Outbreak Data

This is an active and evolving situation, these recommendations may change as more information becomes available.

Recommended actions for individuals who think they may have cyclosporiasis:

People experiencing gastrointestinal illness, such as sudden and ongoing diarrhea, are encouraged to contact their health care provider for testing and treatment. For general questions about the cyclosporiasis outbreak, contact your local health department. Cyclosporiasis is treated with antibiotics along with rest and drinking plenty of fluids to maintain hydration.

Recommended practices for all individuals serving, preparing or consuming lettuce and salad greens in impacted counties:

Michigan residents may resume routine guidance for consuming lettuce and salad greens as new cyclosporiasis case reports and related emergency department visits are on the decline.

General practices to reduce your risk of cyclosporiasis and other foodborne illnesses:

  • Cook when you can. Heating food to 158°F (70°C) or higher kills Cyclospora.
  • Peel produce. Peeling is highly effective for food items with removable skin as the parasite sits on the outer surface.
  • Wash all fresh produce under clean running water, even if you plan to peel it.
    • “Pre-washed” does not guarantee safety and rewashing bagged lettuce is unlikely to remove cyclospora. While washing alone may not fully eliminate cyclospora, it enhances protection when combined with cooking or peeling. 

Additional food safety reminders:

  • Wash hands with soap and water before and after handling or preparing food.
  • Scrub firm fruits and vegetables, such as melons and cucumbers, with a clean produce brush.
  • Cut away any damaged or bruised areas on fruits and vegetables before preparing and eating.
  • Wash and sanitize utensils and surfaces before and after handling food. Wash and sanitize display cases and refrigerators where fresh produce is stored.
  • Wash and sanitize cutting boards, surfaces and utensils used to prepare, serve or store fresh produce.
  • Refrigerate cut, peeled or cooked fruits and vegetables as soon as possible. 

Salmonella Outbreak

MDHHS is aware of a multistate Salmonella Javiana outbreak. For additional information about the outbreak, including case updates, investigation details, and recall information, see the CDC and FDA advisories below.

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