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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: 13,909
Hospitalizations: As of August 13, 2026, 314 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: August 13, 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 weekly on Thursdays by 11:00 a.m. Eastern Time.

 

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

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Detailed Outbreak Data

  •  

    County/Jurisdiction

    Number Cyclosporiasis Cases Reported
    Alcona 22
    Allegan 120
    Alpena 153
    Antrim 3
    Arenac 12
    Barry 39
    Bay 16
    Benzie 3
    Berrien 32
    Branch 18
    Calhoun 391
    Cass 14
    Charlevoix 5
    Cheboygan 3
    Clare 66
    Clinton 247
    Crawford 56
    Delta 2
    Detroit City 417
    Eaton 417
    Emmet 5
    Genesee 647
    Gladwin 5
    Grand Traverse 15
    Gratiot 263
    Hillsdale 71
    Houghton 2
    Huron 51
    Ingham 915
    Ionia 198
    Iosco 37
    Isabella 142
    Jackson 426
    Kalamazoo 354
    Kalkaska 7
    Kent 261
    Lake 14
    Lapeer 39
    Leelanau 2
    Lenawee 414
    Livingston 477
    Luce 1
    Macomb 479
    Manistee 6
    Marquette 4
    Mason 9
    Mecosta 37
    Midland 43
    Missaukee 1
    Monroe 394
    Montcalm 73
    Montmorency 5
    Muskegon 567
    Newaygo 78
    Oakland 1499
    Oceana 43
    Ogemaw 8
    Osceola 48
    Oscoda 4
    Otsego 3
    Ottawa 186
    Presque Isle 13
    Roscommon 14
    Saginaw 100
    Sanilac 44
    Shiawassee 491
    St. Clair 31
    St Joseph 52
    Tuscola 23
    Van Buren 147
    Washtenaw 1093
    Wayne 2029
    Wexford 2

    Last Update: August 13, 2026

    Data notes

    • Case counts reflect all cases of cyclosporiasis reported during the outbreak investigation period and may change as additional information becomes available.
    • One (1) reported cases have an unknown county of residence. As a result, the total shown in the county distribution may not equal the overall case count.
    • Case counts reflect data reported through 9:30 a.m. Eastern Time.
    • Cases by county are updated weekly on Thursdays.

     

  •  

    Age Group

    Number of Cases
    0-9 years 92
    10-19 years 814
    20-29 years 2,381
    30-39 years 2,879
    40-49 years 2,509
    50-59 years 2,083
    60-69 years 1,762
    70-79 years 1,048
    80-89 years 306
    90 years and above 29

    Last update: August 13, 2026

    Data notes

    • Case counts reflect all cases of cyclosporiasis reported during the outbreak investigation period and may change as additional information becomes available.
    • Six (6) cases have an unknown age. As a result, the total shown in the age distribution may not equal the overall case count.
    • Case counts reflect data reported through 9:30 a.m. Eastern Time.
    • Cases by age group are updated weekly on Thursdays.

  • This graph shows the cyclosporiasis cases reported to MDHHS from June 22, 2026, through 9:30 a.m. August 13, 2026.

    This graph shows the cyclosporiasis cases reported to MDHHS from June 22, 2026, through 9:30 a.m. August 13, 2026. Noting July 19 and August 2 inflated cases. 

    Last update: August 13, 2026

    Data notes

    • Case counts reflect all cases of cyclosporiasis reported during the outbreak investigation period and may change as additional information becomes available.
    • The July 19, 2026 reported week includes approximately 475 cases that were not previously reported to MDHHS due to delayed laboratory reporting. These cases do not reflect a sudden increase in illnesses.
    • The August 2, 2026 reported week includes approximately 473 cases that were not previously reported to MDHHS due to delayed laboratory reporting. These cases do not reflect a sudden increase in illnesses.
    • Cases by date reported are updated weekly on Thursdays.

  • This graph shows the week of illness onset for cyclosporiasis cases reported to MDHHS from May 10, 2026, through August 13, 2026.

    This graph shows the week of illness onset for cyclosporiasis cases reported to MDHHS from May 10, 2026, through August 13, 2026. 

    Last update: August 13, 2026

    Data notes

    • Case counts reflect all cases of cyclosporiasis reported during the outbreak investigation period and may change as additional information becomes available.
    • Cases by illness onset are updated weekly on Thursdays.

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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