Cyclospora Outbreak 2026: Latest Cases, Lettuce Recall, Symptoms and Safety Advice

The 2026 Cyclospora outbreak has raised concerns across the US. Learn about the latest case figures, recalled iceberg lettuce, symptoms, treatment and food safety advice.

A major Cyclospora outbreak in the United States continues to draw attention as health officials investigate thousands of illnesses reported across the country. The outbreak has been associated with iceberg lettuce sourced from central Mexico, while health authorities are also tracking other Cyclospora cases that may not be connected to the same source.

The US Food and Drug Administration (FDA) said on August 20 that the specific multistate outbreak linked to recalled iceberg lettuce had reached 10,930 illnesses across 17 states, including 454 hospitalizations and two deaths. The agency said its investigation remains ongoing.

Separately, nationwide surveillance has identified a much broader number of Cyclospora illnesses. Reports from individual states can include both confirmed and probable cases, meaning totals can differ depending on how cases are counted.

What is Cyclospora?

Cyclospora cayetanensis is a microscopic parasite that can cause an intestinal infection known as cyclosporiasis. People become infected when they consume food or water contaminated with the parasite.

The illness is particularly associated with fresh produce. Previous outbreaks have been linked to foods such as leafy greens, herbs, berries and other fresh fruits and vegetables.

According to the Centers for Disease Control and Prevention (CDC), symptoms commonly begin about one week after exposure, although they can appear as soon as two days or more than two weeks later.

This delay can make foodborne outbreaks difficult to investigate. Someone who becomes sick may not immediately remember what they ate several days earlier, while the food involved may no longer be available.

Iceberg lettuce linked to the current outbreak

The FDA and CDC have been investigating an outbreak associated with iceberg lettuce sourced from central Mexico and recalled by Taylor Farms de Mexico.

Taylor Farms announced a voluntary recall on July 17, 2026, covering iceberg lettuce sourced from central Mexico. The recalled products included certain Marketside products sold at Walmart, as well as products distributed to food-service customers.

The FDA said the recalled products had best-by dates that have already passed and should no longer be available for purchase.

The agency has also said that recalled lettuce was distributed to numerous US states, while additional areas may have received the products. Those potentially affected locations included California, Delaware, North Dakota, Rhode Island, South Dakota, Vermont, Washington, Washington, DC, and Puerto Rico.

The FDA has stated that it remains confident recalled iceberg lettuce connected to this particular outbreak has been removed from the market.

Why are case numbers still increasing?

A recall does not necessarily mean that reported illnesses will immediately stop.

One reason is the time between exposure and diagnosis. Cyclospora infections can take days or weeks to produce symptoms. Public health officials may then need additional time to interview patients, conduct laboratory testing and determine whether an illness is connected to a particular outbreak.

The FDA has previously warned that it can take up to six weeks for officials to establish whether a sick person is part of an outbreak.

This means that cases reported after a recall may have resulted from exposure that occurred before the contaminated product was removed from circulation.

The CDC also tracks Cyclospora infections nationally and distinguishes between laboratory-confirmed cases and other reported illnesses. Its surveillance data therefore should not automatically be interpreted as evidence that every Cyclospora infection in the country comes from one source.

What are the symptoms of cyclosporiasis?

The most common symptom is watery diarrhea, which can sometimes be frequent or severe.

Other symptoms can include:

• Loss of appetite
• Weight loss
• Stomach cramps
• Bloating
• Increased gas
• Nausea
• Fatigue
• Vomiting
• Headache
• Body aches
• Low-grade fever

According to the CDC, symptoms can last from several days to a month or longer if untreated. Some people may also experience symptoms that improve before returning later.

Dehydration can become a concern when diarrhea is severe or prolonged. Anyone experiencing significant or persistent symptoms should seek medical advice.

How is Cyclospora diagnosed and treated?

Cyclospora may require specific testing because routine stool testing does not always include the parasite. The CDC advises healthcare professionals to specifically request Cyclospora testing when the infection is suspected.

Treatment is also different from that used for many other intestinal infections. The CDC identifies trimethoprim-sulfamethoxazole, commonly known by brand names including Bactrim and Septra, as the treatment of choice for cyclosporiasis. Treatment decisions should be made by a qualified healthcare professional.

How can people reduce their risk?

Consumers should continue following official food safety guidance and pay close attention to food recalls.

The CDC recommends washing hands with soap and water before and after preparing fresh produce. Fruits and vegetables should also be thoroughly washed under running water before eating, cutting, or cooking. Even produce labelled as pre-washed should be washed.

However, washing does not guarantee that Cyclospora will be removed.

The CDC says cooking produce to an internal temperature of at least 158°F, or 70°C, can kill the parasite.

Consumers should also avoid eating products specifically identified in official recalls. If recalled lettuce was previously stored in a refrigerator or handled in a kitchen, surfaces and containers that came into contact with it should be carefully cleaned and sanitised.

What happens next?

The FDA says its investigation into the iceberg lettuce outbreak is ongoing. The agency has conducted inspections and sampling and is working with Mexican authorities and US state and federal agencies.

The investigation is also part of a broader effort to understand why Cyclospora cases have increased and identify additional sources where necessary.

For consumers, the key message is to rely on official information rather than assuming that every case of cyclosporiasis is connected to the recalled lettuce. The current outbreak linked to iceberg lettuce represents one identified cluster, while other Cyclospora illnesses may have different sources.

Anyone experiencing prolonged or severe diarrhea, dehydration, or other concerning symptoms should contact a healthcare professional and mention any possible exposure to recalled food or recent travel.

Sources

• US Food and Drug Administration, Investigation of Multistate Outbreak of Cyclospora Illnesses: Iceberg Lettuce.
• US Food and Drug Administration, Taylor Fresh Foods Recalls Iceberg Lettuce from Central Mexico.
• Centers for Disease Control and Prevention, Cyclospora Outbreak Linked to Iceberg Lettuce.
• Centers for Disease Control and Prevention, Symptoms of Cyclosporiasis.
• Centers for Disease Control and Prevention, Preventing Cyclosporiasis.

Disclaimer: This article is for general information only and is not medical advice. Case numbers and public health guidance can change as investigations continue. Readers should check the latest information from the CDC, FDA and their local health authorities and speak with a healthcare professional about symptoms or treatment.