2,640 confirmed cases: of cyclosporiasis in Michigan since June 22, with over 1,000 patients interviewed by health officials.
Lettuce and salad greens: are emerging as the most common food item linked to the outbreak, according to early investigative data.
Why this matters:: Cyclosporiasis causes severe gastrointestinal illness — including watery diarrhea, nausea, stomach cramps, and fatigue — that can last for weeks if left untreated. The long incubation period (2 days to 2 weeks) makes traceback investigations complex and slow.
Historical context:: Similar outbreaks have been tied to produce in the past — including imported basil from Mexico in 2019 (2,400+ cases), Guatemalan raspberries in 1997 (1,000+ cases), and lettuce served at McDonald's in 2018.
Cyclosporiasis is caused by the microscopic parasite *Cyclospora cayetanensis*. Infection occurs when people consume food or water contaminated with the parasite. Unlike many foodborne illnesses, cyclosporiasis does not spread easily from person to person, and recreational water exposure — such as swimming in lakes — is not considered a risk factor.
MDHHS, in collaboration with local health departments and federal agencies, has conducted hundreds of interviews with affected individuals. Dr. Natasha Bagdasarian, the state's chief medical executive, stated that lettuce "regularly comes up" as a common product in the investigation. However, officials caution that other food items cannot yet be ruled out, and no specific grower or supplier has been identified.
The complexity of food distribution networks and the parasite's long incubation period mean that a definitive source may take additional time to confirm.
Cyclosporiasis outbreaks have historically been linked to imported fresh produce:
2019:: Over 2,400 cases across 37 states tied to fresh basil imported from Mexico.
1997:: More than 1,000 cases in the U.S. and Canada linked to Guatemalan raspberries.
2005:: Outbreaks linked to basil imports from Brazil, Peru, Mexico, and Costa Rica.
2018:: A multistate outbreak linked to lettuce served at McDonald's restaurants.
MDHHS recommends the following precautions:
Avoid pre-packaged, bagged lettuce and salad greens.: Opt for whole heads of lettuce instead.
Discard the outer 2–3 layers: of leaves when preparing greens, then wash inner leaves thoroughly under clean running water.
Cook greens to at least 158°F: — cooking kills the cyclospora parasite.
Peel produce with removable skin: , as the parasite lives on the outer surface.
Wash all fresh produce: under clean running water, even if you plan to peel it.
These steps are especially critical for high-risk individuals: those with weakened immune systems (e.g., chemotherapy patients, organ transplant recipients), infants, young children, and older adults.
What are the symptoms of cyclosporiasis?
Symptoms include watery diarrhea, nausea, stomach cramps, fatigue, loss of appetite, low-grade fever, weight loss, and vomiting. Symptoms can last for weeks if untreated.
How long after exposure do symptoms appear?
Symptoms typically appear 2 days to 2 weeks after consuming contaminated food or water.
Can cyclosporiasis be treated?
Yes. Cyclosporiasis can be treated with antibiotics. Anyone with frequent watery diarrhea lasting more than a couple of days should contact a healthcare provider and specifically request testing for cyclospora.
Is cyclosporiasis contagious from person to person?
No. The parasite does not spread easily from person to person. The primary risk is foodborne exposure from contaminated fresh produce.
Who this affects most:: Anyone consuming fresh produce in Michigan, particularly those at higher risk of severe dehydration — infants, older adults, and immunocompromised individuals.
What to do now:: Switch to whole heads of lettuce, discard outer leaves, wash produce thoroughly, and cook greens when possible. Avoid pre-packaged bagged salad mixes until the source is confirmed.
When to seek medical help:: If you experience watery diarrhea lasting more than two days, contact your healthcare provider and ask for cyclospora testing. Early treatment with antibiotics can shorten the duration of illness.
Do you think food safety regulations need to be strengthened for imported fresh produce? Share your thoughts in the comments below!
Share this with others who need to stay ahead of this trend!
<div class="share-buttons">
</div>
Detroit Free Press — Michigan cyclosporiasis outbreak investigation zeroes in on lettuce, salad greens
The United States is currently experiencing the largest cyclosporiasis outbreak ever recorded, with nearly **12,000 confirmed and probable c...
A rabid bat was discovered on July 15, 2026, on a busy sidewalk along University Way Northeast near the University of Washington campus in S...
A massive outbreak of cyclosporiasis — a parasitic infection causing severe, long-lasting diarrhea — has spread across at least 34 U.S. stat...
The Centers for Disease Control and Prevention (CDC) has confirmed a multistate outbreak of cyclosporiasis — a parasitic illness causing sev...
⚠ Disclaimer: Yanuki provides article summaries and links for reference only. Yanuki does not endorse, verify, or guarantee the accuracy of third-party sources. Please review original sources and verify information independently. Managed by the Yanuki Data Engine. Full Disclaimer