If you’ve had unexplained, ongoing diarrhea this year, cyclosporiasis might be worth knowing about. A significant multistate outbreak has been unfolding across the U.S. throughout 2026, tied to contaminated produce, and case counts have climbed into the thousands.
This isn’t a minor foodborne bug that flares up and disappears in a day or two — cyclosporiasis can linger for weeks without treatment. Here’s a clear, current breakdown of what’s driving this outbreak, what symptoms to watch for, and what to do if you think you’ve been affected.
What Is Cyclosporiasis?
Cyclosporiasis is an intestinal illness caused by Cyclospora cayetanensis, a microscopic parasite spread through contaminated food or water. According to infectious disease experts, it takes only a small number of the parasite’s infectious cysts to make someone sick, which helps explain how outbreaks tied to a single contaminated product can spread across many states at once.
Unlike some foodborne illnesses that resolve quickly, cyclosporiasis is known for causing prolonged symptoms if left untreated, sometimes lasting anywhere from a few days to several months.
What’s Driving the 2026 Cyclosporiasis Outbreak
The CDC has been tracking a rise in domestically acquired cyclosporiasis cases since May 1, 2026, and the scale of this year’s outbreak has been substantial.
Here’s what investigators have confirmed so far:
- A 15-state outbreak has been linked to iceberg lettuce processed by Taylor Farms de Mexico.
- The company issued a voluntary recall of the affected iceberg lettuce, which was sourced from central Mexico.
- Some of the illnesses were traced to Taco Bell locations across nine states, including Indiana, Kentucky, Michigan, Ohio, West Virginia, Kansas, Oklahoma, Illinois, and Pennsylvania.
- Genetic testing on samples from sick patients showed the Cyclospora parasites were genetically related, reinforcing that these cases stemmed from a common source.
- Cases connected to this outbreak have been reported in more than 30 states nationwide.
Separately, Michigan has experienced its own particularly large outbreak, with state health officials reporting a substantial number of cases concentrated in the southeastern part of the state. As of early September 2026, Michigan alone had recorded thousands of cases, along with hundreds of hospitalizations. Investigators have not yet identified a single specific grower or produce type behind Michigan’s broader outbreak, separate from the confirmed lettuce-linked cluster.
Has Cyclosporiasis Caused Any Deaths?
This is a serious question worth addressing directly. Michigan health officials have confirmed two deaths connected to the state’s cyclosporiasis outbreak. According to public health reporting, both individuals had significant underlying health conditions that were likely impacted by the infection and resulting dehydration, and both became ill before the July 2026 recall was issued.
It’s important to add context here: infectious disease experts widely note that cyclosporiasis is rarely life-threatening, and the vast majority of people who get sick — including many with weakened immune systems — recover fully. Death from this specific infection remains uncommon in the United States.
What Foods Have Been Linked to Cyclosporiasis Outbreaks?
While this year’s confirmed cluster centers on iceberg lettuce, cyclosporiasis outbreaks in the U.S. have historically been tied to a range of fresh produce items, including:
- Bagged salad mixes and salad kits
- Fresh basil and fresh cilantro
- Raspberries
- Snow peas and green onions
This pattern is part of why health officials in affected areas have specifically urged restaurants, food service operations, and households to take extra care when handling raw produce during active outbreak periods.
Symptoms of Cyclosporiasis
If you’ve eaten potentially contaminated produce recently, here’s what to watch for. According to health experts tracking this outbreak, symptoms typically begin about a week after exposure and can include:
- Watery diarrhea, the most common and defining symptom
- Loss of appetite
- Unintended weight loss
- Stomach cramping and bloating
- Nausea
- Fatigue
Without treatment, symptoms can persist for weeks or, in some cases, months, sometimes coming and going in cycles rather than resolving steadily.
How Cyclosporiasis Is Treated
The standard treatment for confirmed cyclosporiasis is a course of the antibiotic trimethoprim/sulfamethoxazole, commonly known by the brand name Bactrim. Alongside this, healthcare providers may also recommend:
- Antidiarrheal medications to help manage symptoms.
- Increased fluid intake to prevent dehydration, which is one of the more serious complications tied to prolonged diarrhea.
Some infections do resolve on their own without antibiotic treatment, but health experts generally recommend treatment for confirmed cases, particularly given how long untreated symptoms can drag on.
How to Reduce Your Risk
Public health agencies have offered consistent guidance for reducing cyclosporiasis risk during this outbreak and in general:
- Wash fruits and vegetables thoroughly before eating them, even if you plan to peel them.
- Cook produce when possible, since cooking can kill the parasite, unlike simple rinsing in some cases.
- Avoid drinking untreated water from lakes, streams, springs, or other unfiltered natural water sources.
- Practice careful hand hygiene, especially after using the bathroom, changing diapers, and before handling or preparing food.
- Avoid contact with human or animal feces, a known route of contamination.
- Check for recall notices on lettuce and other fresh produce, and discard any recalled products even if they look and smell normal.
Since Cyclospora cysts aren’t visible to the naked eye and contaminated produce typically looks completely normal, these preventive habits matter more than trying to visually inspect food for safety.
When to See a Doctor
If you’re experiencing several days of watery diarrhea, especially alongside fatigue, cramping, or unintended weight loss, it’s worth contacting a healthcare provider for testing. This is especially important if:
- Your symptoms have lasted more than a few days without improvement.
- You live in or recently traveled to an area with an active, reported outbreak.
- You have a weakened immune system or an underlying health condition.
- You’re showing signs of dehydration, such as reduced urination, dizziness, or extreme thirst.
Testing typically involves a stool sample, and confirmed cases are usually reported to local health departments as part of ongoing outbreak tracking.
Frequently Asked Questions
1. What is causing the 2026 cyclosporiasis outbreak? A confirmed cluster has been linked to iceberg lettuce processed by Taylor Farms de Mexico, which was recalled, though a broader set of cases across more than 30 states remains under investigation without a single identified source.
2. What are the main symptoms of cyclosporiasis? The primary symptom is watery diarrhea, often accompanied by loss of appetite, weight loss, cramping, bloating, nausea, and fatigue, typically starting about a week after exposure.
3. Is cyclosporiasis treatable? Yes. It’s typically treated with the antibiotic trimethoprim/sulfamethoxazole, along with hydration and antidiarrheal medication as needed, though some cases resolve on their own.
4. Has cyclosporiasis caused any deaths in this outbreak? Michigan health officials have reported two deaths connected to the outbreak, both involving individuals with significant underlying health conditions. Death from cyclosporiasis remains uncommon overall.
5. How does cyclosporiasis spread? It spreads through food or water contaminated with the Cyclospora parasite, most commonly linked historically to fresh produce like leafy greens, herbs, and berries.
6. How can I avoid cyclosporiasis? Thoroughly washing and, when possible, cooking produce, avoiding untreated water sources, practicing good hand hygiene, and checking for active recalls are the main prevention steps recommended by health officials.
7. How long do cyclosporiasis symptoms last? Without treatment, symptoms can last anywhere from a few days to several months, sometimes fluctuating rather than steadily improving.
Final Thoughts
The 2026 cyclosporiasis outbreak is a reminder of how a single contaminated food source can ripple across dozens of states, and how important it is to take persistent gastrointestinal symptoms seriously rather than waiting them out indefinitely. If you’ve experienced watery diarrhea lasting several days, particularly after eating fresh produce like lettuce, it’s worth reaching out to a healthcare provider for testing and appropriate treatment.
Simple habits — thoroughly washing produce, staying alert to recall notices, and practicing good hand hygiene — remain your best everyday defense against this and similar foodborne illnesses.
This article covers a public health outbreak for informational purposes. If you’re experiencing symptoms of cyclosporiasis or any foodborne illness, please consult a licensed medical professional.