FAQs: Cyclospora Recovery, Treatment, and Outbreak Prevention Strategies

There have been more than 4173 reported cases of Cyclospora since May 1, 2026, according to the CDC’s most recent update on July 21, 2026.¹

The FDA and CDC traced the outbreak to shredded iceberg lettuce from Taylor Farms de Mexico, of Guanajuato, Mexico, served at Taco Bell locations; as of July 20, the agency had linked 1947 illnesses and at least 98 hospitalizations across 9 states to that exposure.²

On July 19, the FDA disclosed a false-positive lab sample collected at the border but said the result doesn't change the basis of its investigation, as traceback and epidemiological data continue to point to shredded iceberg lettuce from Taylor Farms de Mexico, and the company's recall remains in effect.³ The company said the recall has been completed and that it will not source iceberg lettuce from central Mexico for the rest of the growing season.

Cyclosporiasis, a food-borne intestinal parasitic infection, can be treated with trimethoprim-sulfamethoxazole (TMP-SMX), the treatment of choice for Cyclospora infection. However, clinicians advise that treatment may not be necessary for every patient, and TMP-SMX is associated with multiple adverse reactions.⁴

Here are 5 common FAQs about what to expect after a cyclospora infection and how health care providers and organizations work together to mitigate risk and optimize patient outcomes.

What should patients expect during recovery from a Cyclospora infection, and when should symptoms prompt a follow-up with a health care provider?

Many people infected with Cyclospora experience profuse watery diarrhea, with symptoms typically beginning about 1 week after exposure. However, many people infected with the parasite may not experience symptoms at all.¹

Asha Shah, MD, director of infectious diseases and epidemiologist at Stamford Hospital, advised individuals to seek medical care for testing and treatment if they begin to exhibit symptoms associated with the infection, she wrote in a written statement to The American Journal of Managed Care^® (AJMC^®).

She emphasized that other symptoms could include loss of appetite, nausea, bloating, weight loss, and fatigue. Although these symptoms are not specific to Cyclospora infection, it’s still important to seek care if experiencing any of them.

What patient populations may require additional outreach or monitoring during a Cyclospora outbreak?

Patients who are immunocompromised, older adults, and those with limited access to care may be at additional risk for severe, chronic, and/or prolonged illness, Shah wrote.

“They may require longer courses of antibiotics,” she wrote. “Immunocompromised individuals should contact their healthcare providers promptly if they develop gastrointestinal illness.”

Pregnant individuals, young children, and people with chronic medical conditions may also benefit from closer clinical evaluation if they develop prolonged diarrhea or signs of dehydration. Although Cyclospora is often self-limiting in otherwise healthy individuals, these populations may be more susceptible to complications related to fluid loss, nutritional deficiencies, or prolonged illness, making early communication with a health care provider especially important.¹

Can antibiotics used to treat Cyclospora increase the risk of other infections, such as Clostridioides difficile, and how can that risk be reduced?

TMP-SMX is a combination antibiotic commonly used to treat bacterial infections, including urinary tract infections, middle ear infections, bronchitis, and traveler’s diarrhea.⁵ However, it is not without adverse events.

Prior research has associated TMP-SMX with Clostridioides difficile (C difficile) infection. Although the risk is lower than with several other antibiotic classes, it remains clinically significant.⁶

“C diff often has a characteristic type of presentation. It causes a wide variety of symptoms also, and sometimes people are just colonized with C diff and don't have active toxic colitis from [it],” said Bruce Hirsch, MD, assistant professor of medicine at the Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, in an interview with AJMC^®. “But the characteristic findings are profuse, absolutely watery diarrhea; 6, 8, 10, [or] 12 more bowel movements over the course of the day; and C diff makes a metabolic product called p-cresol, [which] has a very peculiar odor.”

Although the public’s attention is focused on the current cyclospora outbreak, Hirsch said a confirmed diagnosis is really important given the numerous other infectious diseases that can cause diarrhea, adverse antibiotic reactions included.

Cyclospora testing uses specialized molecular PCR panels assessing stool samples, and in addition to a diagnosis, when considering antibiotics, Hirsch said it’s important to understand the patients’ health profile.

There are multiple questions clinicians should consider when assessing a patient’s need for antibiotics to treat a Cyclospora infection: “Who is the patient? Do they have a weakened immune system? Are they frail? Are they immunocompromised? Are they going to need the assistance of antibiotics to get through it? And how severely affected are they by this infectious diarrhea?”

What are the CDC and FDA doing to investigate Cyclospora outbreaks and prevent future foodborne illnesses?

The CDC is collecting data on the outbreak through routine public health surveillance, such as clinicians and clinical laboratory-reported cases to local and state health departments.¹ The departments use standardized questionnaires that capture clinical, demographic, and exposure information. Local and state health departments then use this information to report suspected clusters or outbreaks when they occur to the CDC.

The CDC, in collaboration with state public health laboratories and the FDA, also uses this data and food traceback information to help identify the source of an outbreak.

Because food outbreaks can occur in multiple produce ingredients, it may be difficult to isolate the source. Whole genome sequencing is also unavailable for the Cyclospora parasite, making it even more difficult to track. However, the CDC uses genetic testing that targets specific markers in stool samples to aid their search for identifying the source.¹

“Public health agencies help with identifying a common source of food outbreaks using tracing methods and other epidemiologic tools,” Shah wrote. “When these systems fail, clinicians can play a role by taking more detailed histories about exposures in patients who are sick with the foodborne illness. For example, asking what foods they ate or from where.”

What steps can consumers take to reduce their risk of Cyclospora infection during an active outbreak, even when recalls have already been issued?

The CDC and FDA are currently monitoring the outbreak and continue to share updated guidance on safe produce-handling practices. Consumers should follow the latest CDC and FDA recommendations, including thoroughly washing produce before eating or preparing it and monitoring food recall notices as the investigation continues.⁴

Shah also recommends performing hand hygiene and following federal agency notices to thoroughly wash produce before eating, cutting, or cooking.

“Cooking can also kill the parasite, so cooked produce is the safest,” she wrote. “Stay up-to-date with food recalls, and if symptoms develop, seek care from your doctor.”

Despite the July 19 false-positive sample, the FDA reiterated that its traceback and epidemiological findings still point to Taylor Farms' central Mexico–grown iceberg lettuce, and it will continue to collect and analyze product samples to identify a source of the outbreak.²

References

1. Surveillance of cyclosporiasis. CDC. July 21, 2026. Accessed July 23, 2026. https://www.cdc.gov/cyclosporiasis/php/surveillance/index.html

2. Investigation of 5-state outbreak of cyclospora illnesses: Iceberg Lettuce (July 2026). US FDA. July 19, 2026. Accessed July 23, 2026. https://www.fda.gov/food/outbreaks-foodborne-illness/investigation-5-state-outbreak-cyclospora-illnesses-iceberg-lettuce-july-2026

3. Taylor Fresh Foods statement regarding Cyclospora outbreak. News release. Taylor Farms. July 20, 2026. Accessed July 24, 2026. https://www.taylorfarms.com/newsroom/taylor-fresh-foods-statement-regarding-cyclospora-outbreak/

4. McCrear S. Michigan cyclospora outbreak surpasses 1500 cases as investigation continues. AJMC. July 10, 2026. Accessed July 23, 2026. https://www.ajmc.com/view/michigan-cyclospora-outbreak-surpasses-1500-cases-as-investigation-continues

5. Sulfamethoxazole and trimethoprim (oral route) - side effects & dosage. Mayo Clinic. Accessed July 23, 2026. https://www.mayoclinic.org/drugs-supplements/sulfamethoxazole-and-trimethoprim-oral-route/description/drg-20071899

6. Teng C, Reveles KR, Ofoegbu OOO, Frei CR. Clostridium difficile infection risk with important antibiotic classes: an analysis of the FDA adverse event reporting system. Int J Med Sci. 2019;16(5):630–635. doi:10.7150/ijms.30739