As of August 17, 2026, the CDC has confirmed 15,716 domestically acquired cyclosporiasis cases across 47 states, with 828 hospitalizations and two deaths. The outbreak is linked to contaminated iceberg lettuce from central Mexico supplied by Taylor Farms de Mexico, and health officials are investigating over 11,000 additional possible cases. The true burden of illness is likely much higher than the confirmed count.
What Is Cyclosporiasis and How Do You Get It
Cyclosporiasis is an intestinal infection caused by the microscopic parasite Cyclospora cayetanensis. People get sick when they consume food or water contaminated with fecal matter containing Cyclospora oocysts, most commonly through fresh produce like leafy greens, herbs, and berries.
The parasite is endemic in tropical and subtropical regions, and outbreaks in the US are typically linked to imported produce. Unlike many foodborne pathogens, Cyclospora needs days to weeks after being shed in feces before it becomes infectious, which means person-to-person spread is extremely rare.
How infection happens:
- Contaminated irrigation water or soil contacts crops during growing
- Produce is harvested and shipped without adequate washing
- Consumers eat raw or undercooked contaminated food
- The parasite travels to the small intestine and begins multiplying
A critical detail: Cyclospora cannot be killed by routine water rinsing alone. Consumer Reports food-safety expert James Rogers advises scrubbing produce with a clean brush and heating foods to at least 158°F (about 70°C) to inactivate the parasite.
Cyclosporiasis Symptoms: What Should I Watch For
Symptoms of cyclosporiasis typically begin one to two weeks after exposure and can last for weeks or months if untreated. The most common symptoms include watery diarrhea, loss of appetite, weight loss, stomach cramps, bloating, nausea, and fatigue.
Key symptoms to watch for:
- Watery, frequent diarrhea (the hallmark symptom)
- Loss of appetite and significant weight loss
- Stomach cramps and bloating
- Nausea and vomiting (less common)
- Fatigue and body aches
- Low-grade fever (occasional)
What sets cyclosporiasis apart from typical food poisoning is its duration. Most bacterial foodborne illnesses resolve in a few days, but cyclosporiasis can persist for a month or longer, with symptoms that seem to improve and then return. If you experience prolonged diarrhea lasting more than a few days, especially during an active outbreak, seek medical attention.
Where Did the Cyclosporiasis Outbreak Come From and Which Foods Are Causing It
The 2026 cyclosporiasis outbreak has been epidemiologically linked to shredded or processed iceberg lettuce supplied by Taylor Farms de Mexico, sourced from central Mexico. The lettuce was served at some Taco Bell restaurants and sold as Marketside-brand products at select Walmart locations.
According to CDC and FDA investigations, outbreak-associated illnesses tied to the Taylor Farms iceberg lettuce recall total 9,481 reported infections across 17 states. Taylor Farms voluntarily recalled all iceberg lettuce grown in central Mexico on July 17, 2026, and stated it will no longer source iceberg lettuce from that region for the remainder of the growing season. The company has also emphasized that its branded salad kits do not contain iceberg lettuce.
The FDA has initiated inspections at Taylor Farms de Mexico and continues to focus on iceberg lettuce from central Mexico as the likely vehicle. However, officials note that traceback data point to a specific independent farm representing less than 1% of US iceberg lettuce supply, and no product tests have yet definitively confirmed Cyclospora contamination, according to FDA investigation updates.
Cyclosporiasis Cases in US Climb to 15,716, CDC Says: Which States Are Hardest Hit
Illinois is among the hardest-hit states, with the Illinois Department of Public Health reporting around 1,400+ confirmed and probable cyclosporiasis cases. Cases have been reported across 47 states, making this a truly national outbreak.
Earlier in the summer, the CDC reported 1,947 lab-confirmed outbreak cases across nine states: Illinois, Indiana, Kansas, Kentucky, Michigan, Ohio, Pennsylvania, Oklahoma, and West Virginia, as covered by ABC News. The outbreak expanded geographically over time from an initial five-state cluster into a broader multistate event, with at least 15 states now having cases epidemiologically linked to iceberg lettuce.
Most affected regions:
- Midwest: Illinois, Indiana, Michigan, Ohio, Kentucky
- Mid-Atlantic: Pennsylvania, West Virginia
- Plains: Kansas, Oklahoma
- Additional states continue reporting cases as the outbreak spreads
Cyclosporiasis Cases in US Climb to 15,716, CDC Says: Outbreak Timeline and Key Dates
The 2026 cyclosporiasis season began with cases reported starting May 1, with the outbreak escalating rapidly through the summer months. The CDC’s surveillance data shows a dramatic climb from 13,895 lab-confirmed illnesses and 740 hospitalizations as of August 11 to 15,716 illnesses and 828 hospitalizations by August 17.
Timeline of key events:
- May 1, 2026: Cyclosporiasis season begins; early cases reported
- Early summer: Initial five-state cluster identified in the Midwest
- Mid-July: Outbreak expands to nine states; CDC reports 1,947 lab-confirmed cases
- July 17, 2026: Taylor Farms de Mexico voluntarily recalls all iceberg lettuce from central Mexico
- Late July: At least 15 states report cases linked to iceberg lettuce
- August 11, 2026: 13,895 confirmed cases, 740 hospitalizations
- August 17, 2026: 15,716 confirmed cases, 828 hospitalizations, 2 deaths
According to CDC surveillance data, the rapid escalation makes the 2026 season one of the largest cyclosporiasis outbreaks on record. The CDC and Reuters also report that at least 11,841 additional possible cases are under review, requiring further investigation before classification.
Is Cyclosporiasis Contagious Person to Person
No, cyclosporiasis is not typically spread from person to person. The Cyclospora parasite requires days to weeks after being shed in feces before it becomes infectious, making direct human-to-human transmission extremely unlikely.
This is an important distinction from other diarrheal illnesses like norovirus or salmonella, which can spread rapidly through households and workplaces. With cyclosporiasis, the source is almost always contaminated food or water, not contact with an infected person.
However, if multiple people ate the same contaminated food, they could all become ill around the same time, which might look like person-to-person spread but is actually a shared food source.
Cyclosporiasis Treatment: How Long Does It Take to Recover
Cyclosporiasis is treated with the antibiotic trimethoprim-sulfamethoxazole (TMP-SMX), commonly known as Bactrim or Septra. Most people begin to feel better within a few days of starting treatment, but full recovery can take a week or more.
What to expect during treatment:
- Antibiotics are the standard and most effective treatment
- Symptoms typically improve within 1 to 3 days of starting medication
- Full recovery usually takes about a week
- Without treatment, symptoms can last for weeks to months
- People with weakened immune systems may need longer treatment
If you’re allergic to sulfa drugs or treatment isn’t working, your doctor may explore alternative options. The key is getting diagnosed early through a stool test specifically ordered for Cyclospora, since standard stool cultures may not detect the parasite.
Do I Need to See a Doctor for Cyclosporiasis and What Happens If Untreated
Yes, you should see a doctor if you suspect cyclosporiasis, especially during an active outbreak. Left untreated, the infection can cause weeks or months of debilitating diarrhea, significant weight loss, and severe fatigue.
When to seek medical care:
- Diarrhea lasting more than three days
- Signs of dehydration (excessive thirst, dark urine, dizziness)
- High fever
- Blood in stool
- Inability to keep fluids down
Complications of untreated cyclosporiasis:
- Severe dehydration requiring IV fluids
- Malnutrition and significant weight loss
- Prolonged fatigue affecting daily life
- Reactive arthritis (rare)
- Gallbladder disease (rare)
The two deaths reported in the current outbreak underscore that cyclosporiasis can be serious, particularly for older adults, pregnant women, and people with weakened immune systems. Don’t wait it out if symptoms persist.
Cyclosporiasis vs Food Poisoning: What’s the Difference
The main difference between cyclosporiasis and typical food poisoning is the cause and duration. Cyclosporiasis is caused by a parasite, not bacteria or a virus, and symptoms last much longer than most foodborne illnesses.
| Feature | Cyclosporiasis | Typical Food Poisoning |
|---|---|---|
| Cause | Parasite (Cyclospora) | Bacteria, virus, or toxin |
| Onset | 1-2 weeks after exposure | Hours to days |
| Duration | Weeks to months (if untreated) | 1-7 days typically |
| Treatment | Antibiotics (TMP-SMX) | Usually supportive care |
| Person-to-person | No | Sometimes (norovirus, salmonella) |
| Key symptom | Prolonged watery diarrhea | Vomiting and/or diarrhea |
A common mistake is assuming cyclosporiasis will pass like regular food poisoning. If your symptoms last more than a few days, ask your doctor about a Cyclospora-specific stool test.
How to Prevent Cyclosporiasis When Buying Groceries and Dining Out
Preventing cyclosporiasis requires careful attention to produce handling and awareness of outbreak alerts. Since the parasite resists routine washing, cooking is the most reliable way to eliminate the risk.
Prevention steps:
- Check CDC outbreak alerts and FDA recall notices before shopping
- Discard any recalled Marketside iceberg lettuce products
- Avoid eating shredded iceberg lettuce at Taco Bell locations in affected states (Indiana, Kentucky, Michigan, Ohio, and West Virginia)
- Scrub all produce with a clean brush under running water
- Cook foods to at least 158°F (about 70°C) to inactivate Cyclospora
- Wash hands thoroughly before handling food
Can you get cyclosporiasis from restaurants? Yes. In fact, the current outbreak was first identified in restaurant-linked cases. When dining out during an active outbreak, ask about the source of leafy greens and consider cooked dishes over raw salads if you’re in a high-risk category. As CNN reported, the outbreak spread through both restaurant-served and grocery-sold lettuce, making consumer awareness essential at every point of purchase.
Cyclosporiasis Cases in US Climb to 15,716, CDC Says: How Common Is It Compared to Other Foodborne Illnesses
Cyclosporiasis is less common than major bacterial foodborne illnesses like salmonella or campylobacter, but the 2026 outbreak has pushed case counts to historic levels. The 15,716 confirmed cases this season represent one of the largest cyclosporiasis outbreaks ever recorded in the United States.
For context, the CDC typically receives reports of 1,000 to 2,000 cyclosporiasis cases annually in non-outbreak years. The 2026 season has produced roughly 8 to 15 times that baseline, driven by the Taylor Farms lettuce outbreak.
Meanwhile, salmonella causes approximately 1.35 million infections per year in the US, and norovirus causes about 20 million. Cyclosporiasis remains a smaller threat in raw numbers, but its prolonged illness duration and resistance to standard food safety practices make it a significant public health concern when outbreaks occur.
Conclusion
The 2026 cyclosporiasis outbreak is a stark reminder that our food supply chain carries real risks, and that public health surveillance matters. With 15,716 confirmed cases, 828 hospitalizations, and two deaths across 47 states, this outbreak has touched communities nationwide, including right here in the Mohawk Valley.
What you can do:
- Check your refrigerator for recalled Marketside iceberg lettuce products and discard them immediately
- Stay informed by following CDC and FDA outbreak updates
- Contact your healthcare provider if you experience prolonged diarrhea
- Support stronger food safety regulations by contacting your elected representatives
- Advocate for better oversight of imported produce at the federal level
In upstate New York and across the country, we deserve a food system that doesn’t make us sick. Holding companies like Taylor Farms accountable, strengthening FDA inspection authority for imported produce, and investing in public health infrastructure are all steps toward that goal. The next outbreak is only a harvest season away, and how we respond now will determine whether our communities are protected when it arrives.
FAQ
What is cyclosporiasis?
Cyclosporiasis is an intestinal infection caused by the Cyclospora cayetanensis parasite, typically transmitted through contaminated food or water.
How many cyclosporiasis cases are there in 2026?
As of August 17, 2026, the CDC has confirmed 15,716 domestically acquired cases across 47 states, with 828 hospitalizations and 2 deaths.
What food caused the 2026 cyclosporiasis outbreak?
Shredded iceberg lettuce from Taylor Farms de Mexico, sourced from central Mexico, has been epidemiologically linked to the outbreak.
Is cyclosporiasis contagious?
No. Cyclospora requires days to weeks after being shed in feces to become infectious, making person-to-person spread extremely unlikely.
How is cyclosporiasis treated?
The antibiotic trimethoprim-sulfamethoxazole (TMP-SMX) is the standard treatment. Most people improve within days of starting medication.
How long does cyclosporiasis last without treatment?
Without treatment, symptoms can persist for weeks to months, with periods of improvement followed by relapse.
Can washing produce prevent cyclosporiasis?
Routine washing reduces risk but does not reliably eliminate Cyclospora. Cooking food to at least 158°F (70°C) is the most effective method.
Which states have the most cyclosporiasis cases?
Illinois is among the hardest hit with approximately 1,400+ cases. The Midwest and Mid-Atlantic regions have seen the highest concentration of outbreak-linked cases.
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