Cyclosporiasis Stomach Infection Is Surging in the US: What You Need to Know

Understanding the Cyclosporiasis Stomach Infection and Its Symptoms

Cases of cyclosporiasis, a parasitic illness that causes stomach problems, are spreading quickly in the United States, and these cases seem to be a "mystery". Almost every summer, we get a relatively small number of cyclosporiasis outbreaks in the United States, but this summer has seen a significantly higher number of cases. There is a wider geographic spread and numerous cases. Michigan has been hit especially hard. As of this writing (8/5/2026), the CDC reports cases have spread to 47 states. All told, there have reportedly been 517 hospitalizations and two deaths. These cases have been reported but not yet confirmed. Information obtained from the Michigan Department of Health and Human Services - where the first major outbreak began - (updated 7/29/26) reports 2 deaths and 12,226 cases in that state alone. Other states are quickly catching up (see map). They are seeing more clusters of these outbreaks than they normally see.

Transmission  

Cyclospora are parasites that typically live in environments where soil or water has been contaminated with human feces (poop). They are not naturally present in clean U.S. soil or water; however, numbers usually increase a bit in the summer. This summer, we are facing an inordinately high number of Cyclospora-related illnesses. The parasites are contaminating something in our food supply. Patterns from past outbreaks suggest that contaminated fresh imported produce is the most likely source, particularly because it is common-even endemic - in many tropical and subtropical areas. Though rare, U.S.-associated outbreaks have occurred in the past. In any case, people are getting sick from these products, and the problem has been spreading fast.

When Cyclospora spreads to people, it is usually through contaminated food and/or drinking water. Unfortunately, in late May 2026, many people started to become ill (and continue to become ill). Sources of this spreading illness remained largely undiscovered for 6-7 weeks because of 2025 congressional restrictions imposed on the FDA, which blocked the FDA's traceability rules on foodborne illnesses. Finally, after recognizing the severity of the spread and after overcoming several hurdles, the FDA obtained traceback materials and identified the parasite Cyclospora as the main culprit. As of this writing (7/19/2026), the CDC and FDA traceback investigations confirmed that shredded iceberg lettuce from Taylor Farms of Mexico was likely the main source of the Taco Bell–associated Cyclospora outbreak in five states (Michigan - the most widely affected state - Indiana, Kentucky, Ohio, and West Virginia). Taco Bell was very quick to remove it from its stores.

Interestingly, the FDA claimed that their lettuce testing for Cyclospora was actually a "false-positive"; however, many of the original illnesses have been traced back to Taco Bell, so the FDA determined that it was the iceberg lettuce being used. There is a lot of questionable validity to this, and the general consensus is that you are better safe than sorry: You do not want to contract this illness, so don't eat the lettuce.

It is also important to note that Taylor Farms’ shredded iceberg lettuce wasn’t just going to Taco Bell. According to recent FDA reports, it was distributed widely across the U.S. to Walmart, Target, Kroger, Meijer, Dollar General, and food‑service suppliers in 27 states, meaning many restaurants, cafeterias, and institutional kitchens were using the same product (FDA is limited in what they can specifically divulge). While Taylor Farms iceberg lettuce has been recalled from several stores and restaurants, it has not specifically been specifically recalled from Target, Kroger, Meijer, or Dollar General because they did not have confirmed contaminated lots.

Other common vegetables linked to Cyclospora outbreaks include the following:

• Basil

• Cilantro

• Spinach (occasionally)

• Romaine lettuce

• Mesclun lettuce/spring mix

  • Traditional mixes: arugula, frisée, baby lettuce, radicchio, spinach

  • Modern mixes: chervil, mâche (lamb’s lettuce), endive, tatsoi, mustard greens, other leafy varieties

• Raspberries

• Snow peas

• Sweet peas

Prepackaged produce is more often the culprit than individually sold produce. Fresh vegetables from produce markets are generally a safer option.

It is important to note that you cannot see Cyclospora because it is a microscopic parasite — far too small to detect with the naked eye. Contaminated produce looks completely normal: no spots, slime, discoloration, or odor. The texture, color, and smell of vegetables or fruits do not change, and there is no obvious residue.

SYMPTOMS

The cyclosporiasis stomach infection: A key to symptom recognition.

After ingestion, the Cyclospora parasite multiplies and irritates and damages the cells of the gastrointestinal (GI) tract, which, in turn, triggers many of the following symptoms:

A Woman feeling ill

• Watery, sometimes “explosive,” diarrhea (often 6+ stools/day) — prolonged beyond 24–48 hours

• Stomach cramps

• Gas and bloating

• Nausea, and sometimes (though less often) vomiting

• Loss of appetite

• Possible weight loss (no, this is NOT the diet you want to be on!)

• Fatigue

• Low‑grade fever

Without treatment, cyclosporiasis can last weeks to months, often with symptoms that come and go. With proper treatment, recovery is typically much quicker.

Those at greater risk for developing severe symptoms include:

• Individuals with underlying risk factors (very young or older age, diabetes, altered immunity, and other conditions that weaken the body’s ability to fight infection)

• People who are not in good overall health or who do not take care of themselves  (poor nutrition, dehydration, unmanaged chronic illness, or inadequate rest can worsen the course of illness).

Cyclosporiasis: what you need to know about the diagnosis, care and treatment approaches

Diagnosis usually involves two key steps:

• A clinician will typically obtain a detailed history of the illness, asking about recent foods eaten, travel, symptom timing, and any possible exposures.

• Stool testing

  • Specific testing for Cyclospora (this must be ordered intentionally — it is not included in routine stool tests).

  • Molecular assays such as PCR‑based gastrointestinal multiplex panels can detect Cyclospora when included.

  • Important: The standard ova and parasite (O&P) test does not detect this parasite, which is why cases are often missed at first.

Approaches to Treatment and Care

Cyclosporiasis stomach infection: Empiric Treatment

Empiric treatment (treating based on symptoms before test results are available) can be initiated with antibiotics if testing is delayed or unavailable. However, it is not generally recommended because unnecessary antibiotic use can cause other problems. A clinician should guide this decision.

Prescription Medications

Antibiotics:

• TMP‑SMX (Bactrim) is the first-line treatment. It is a sulfa‑based medication. This is the only reliably effective antibiotic for cyclosporiasis.

• Ciprofloxacin (Cipro) is less effective than TMP‑SMX but is sometimes used as a second‑line option for those allergic to sulfa-based medications.

Nausea and Vomiting:

• Ondansetron (Zofran) helps with nausea and vomiting.

  
  

Over‑the‑Counter Medications

• Loperamide (Imodium) can help slow diarrhea. This is supportive care only — it does not kill the parasite. Should not be used if there is fever, bloody stools, or signs of severe illness. When unsure, speak with a primary care provider.

  
  

Supportive Care

-Hydration

Drink plenty of water in small, frequent sips. Dehydration can cause severe illness, especially in children, older adults, and immunocompromised patients.

Signs of dehydration include:

• Dizziness

• Dry mouth

• Reduced urination

• Feeling faint

• Rapid heart rate

• Sunken, dark eyes

  
  

-Electrolytes

Diarrhea causes loss of electrolytes like sodium and potassium, which can lead to additional medical problems.

Helpful electrolyte sources:

• Pedialyte

• Low‑sugar sports drinks

• WHO oral rehydration packets (available at pharmacies — ask a pharmacist)

If you have a known electrolyte imbalance, speak with your primary care provider.

Foods naturally containing electrolytes:

• Bananas

• Potatoes

• Broths

• Yogurt (if tolerated)

  
  

-Recommended Diet

Low‑fiber foods help reduce bowel stimulation and may slow diarrhea.

Gentle foods:

• White rice

• Plain pasta

• Toast

• Saltine crackers

• Oatmeal

• Cream of wheat

• Bananas

• Applesauce

• Boiled potatoes

• Soft scrambled eggs

  
  

Lean proteins:

These help maintain strength while ill:

• Chicken (boiled or baked)

• Turkey

• White fish

• Tofu

  
  

Foods to AVOID

• High‑fiber foods (raw vegetables, salads, bran, legumes)

• Greasy or fried foods

• Spicy foods

• Dairy (if it worsens symptoms)

• Caffeine

• Alcohol

• High‑sugar drinks (can worsen diarrhea)

Prevention

-Washing

Washing produce does not reliably remove Cyclospora — it may reduce contamination, but it cannot eliminate it.

Still, general food‑safety washing is helpful:

• Wash all produce thoroughly under running water.

• Choose whole heads of lettuce or leafy greens rather than prewashed, bagged mixes.

• Remove and discard the outer 2–3 leaves.

• Wash inner leaves individually under running water.

• Do not soak produce (soaking can spread contamination).

-Peeling

Peeling fruits and vegetables can reduce surface contamination, but it does not guarantee removal of Cyclospora.

-Cooking

Cooking is the only reliable kill step for Cyclospora.

• Heat food to an internal temperature of 158°F (70°C).

• This temperature instantly inactivates the parasite.

• Cyclospora is a heat‑sensitive parasite, so proper cooking is highly effective.

-Avoidance

Because Cyclospora cannot be seen, smelled, or tasted, avoidance strategies focus on reducing exposure:

• Be cautious with prepackaged salad mixes during outbreak season.

• Choose whole, unprocessed produce when possible.

• Follow public health updates about ongoing outbreaks and implicated foods.

• When in doubt, cook produce rather than eating it raw.

What Can You Eat Without Worrying About Cyclospora Contamination?

The following vegetables and fruits have no known history of Cyclospora contamination and are considered low‑risk, especially when washed and, when appropriate, cooked (1).

• Zucchini

• Yellow squash

• Cucumbers

• Bell peppers

• Carrots

• Broccoli

• Cauliflower

• Green beans

• Potatoes

• Onions

• Tomatoes

• Cabbage (green, red)

• Celery

• Corn

• Mushrooms

• Apples

• Bananas

• Oranges/citrus

• Melons

• Grapes

• Avocados

Complications and Prognosis of Cyclosporiasis

-Possible complications include:

• Severe dehydration from prolonged diarrhea, leading to dizziness, weakness, rapid heart rate, and reduced urination.

• Electrolyte imbalance: Loss of sodium, potassium, and other electrolytes can cause muscle cramps, irregular heartbeat, or worsening fatigue.

• Weight loss and malnutrition due to prolonged diarrhea, nausea, and reduced appetite.

• Prolonged or relapsing illness: Symptoms may improve and then return if untreated.

• Secondary complications, such as worsening of underlying medical conditions (diabetes, heart disease, kidney disease).

Rare complications

Cyclospora does not typically cause bloodstream infections, organ failure, or long‑term damage. Severe outcomes are uncommon but can occur in people who cannot maintain hydration or who have significant immune compromise.

-PROGNOSIS

With treatment (TMP‑SMX):

• Most people recover quickly, often within a few days.

• Symptoms usually resolve completely.

• Relapses are uncommon once treatment is completed.

Without treatment:

• Illness can last weeks to months.

• Symptoms may wax and wane.

• Dehydration and fatigue can become significant.

• People may struggle to maintain normal daily activities.

  
  

Long‑term outlook:

• Cyclospora does not cause chronic infection.

• It does not remain in the body once symptoms resolve.

• No long‑term organ damage is expected.

• Prognosis is excellent with proper hydration and appropriate antibiotics.

Questions??

Can a person spread Cyclospora to another person?

No.   Cyclospora oocysts shed in stool are not infectious until they mature in the environment for days to weeks.

This means:

• Changing a diaper is not a risk.

• Household contact is not a risk.

• Cyclospora cannot be passed directly from person to person.

Even if someone is infected today, the parasite they shed cannot infect anyone until it has matured for a while outside the body.

Does vinegar kill Cyclospora?

No.   Vinegar may reduce bacteria, but Cyclospora oocysts are resistant to:

• Vinegar

• Lemon juice

• Salt water

• Soap

• Household disinfectants

• Typical produce washes

Cooking reliably destroys Cyclospora.

Are frozen foods okay?

Yes.   Cyclospora has never been linked to commercially frozen foods in CDC outbreak investigations.

-Frozen foods with no known Cyclospora history:

• Frozen vegetables

• Frozen fruits

• Frozen mixed produce

• Frozen meals

• Commercially frozen berries

-Why frozen foods are safe

• Freezing prevents Cyclospora from maturing into an infectious form.

• Many frozen foods are blanched before freezing, which further reduces the risk of contamination.

• CDC outbreak history shows zero frozen food involvement.

Do plants absorb parasites into their leaves?

No.   Plants do not absorb Cyclospora through their leaves. Cyclospora stays on the surface of produce — it does not enter leaf tissue, veins, or the plant’s internal water system.

Can Cyclospora spread from one garden to another?

Yes — but only through environmental contamination, not person‑to‑person spread.   Cyclospora cannot “jump” between plants or move through the air. It can only be carried by contaminated soil or water moving from one area to another.

How could a garden become contaminated with Cyclospora?

1. Water runoff

Contaminated soil or water can wash downhill or across property lines during:

• Heavy rain

• Irrigation overflow

• Sloped yards

2. Shared water sources

If water is contaminated upstream, multiple gardens can be exposed:

• Rain barrels

• Irrigation hoses

• Wells

3. Soil displacement

Cyclospora oocysts can be physically moved in:

• Flooding

• Erosion

• Digging or landscaping

4. Animal tracking soil

This is mechanical transport, not infection:

• Pets

• Wildlife

• Birds and animals can carry contaminated dirt on their paws or feet.

5. Other contamination sources

• Sewage leaks

• Contaminated water sources

• Inadequate farm‑worker sanitation

If you care to read about it further, there is a very interesting backstory behind this Cyclospora outbreak and the actors involved, the restrictions on the FDA, false-positive tests, possible money changing hands - and so on (for example, check Forbes, the FDA, AI - Copilot, and others).

Please note: This information changes quickly from day to day and source to source. We aim to be accurate (as mentioned, the CDC information is behind). Check back for more information as it is added or as it changes.