Cyclosporiasis Cases Reach 5100: Investigators Zero in on Lettuce, Possible Taco Bell Link

The cyclosporiasis outbreak continues to accelerate, with case counts now several times higher than the more than 450 infections noted in early July. Independent state-by-state tallies suggest the true burden is already far higher than the CDC's confirmed figures.

NBC News reported roughly 5010 cases across at least 31 states as of July 14, with at least 86 hospitalizations nationwide.² Michigan remains the epicenter: state health officials reported 3309 total cases as of July 9, with 44 hospitalizations.³ Illinois, New York, and Texas round out the states with the highest burden.⁴

Investigators Name Their First Real Lead: Lettuce

For weeks, no common food source had been identified until Michigan's health department announced that lettuce or salad greens are the leading suspected source of its share of the outbreak on July 13, 2026.

"Early information has shown lettuce as a common product that regularly comes up during the investigation," said Natasha Bagdasarian, MD, the state's chief medical executive, cautioning that a specific grower, supplier, or product type has still not been pinpointed and that other foods cannot be completely ruled out.^5,6 The finding follows more than 1000 patient interviews conducted by state, local, and federal investigators.⁶

The lead has also opened a more specific line of inquiry: The Washington Post reported July 14 that federal and state officials are investigating whether Taco Bell restaurants played a role in the outbreak, which has affected over 4000 people nationwide. No product, restaurant chain, or supplier has been formally confirmed as the source.⁷

Michigan has updated its consumer guidance, recommending that shoppers buy whole heads of lettuce rather than prewashed, bagged greens or premixed salad kits and discard the outer 2 to 3 leaves before preparing the rest. Notably, the state also warns that rewashing bagged lettuce at home is unlikely to remove Cyclospora oocysts, which adhere tightly to plant surfaces.³

"Foodborne illnesses are not uncommon, but it is a little concerning they haven't identified a source yet,” explained Marilyn Bulloch, PharmD, BCPS, FCCM, an associate clinical professor in the Department of Pharmacy Practice at the Auburn University Harrison College of Pharmacy, in an email to Pharmacy Times. “I personally am staying away from fresh fruits and veggies that cannot be peeled or cut open—like watermelon—because you cannot wash the bacteria off. The exception being ones from the home garden of someone I know. That is hard in the summer when these foods are a staple. Unfortunately, the incubation is 1 week to 2 weeks. Tracing it that far back is difficult."

On treatment, Bullloch emphasized starting therapy without delay. "Get bactrim as soon as possible. For those with sulfate allergies, ciprofloxacin can be used. However, it's important to be reserved due to the issues with quinolones. Electrolyte replacement and hydration are key."

Does Reduced Surveillance Funding Play a Role?

Whether reduced federal surveillance capacity is playing a role in this particular investigation is an open question. What is documented is that in 2025, amid staffing and budget cuts to public health agencies, the CDC scaled back FoodNet, the surveillance system it runs with the USDA, FDA, and 10 state health departments to proactively catch foodborne illness by contacting labs directly rather than waiting for cases to be reported.

Before July 1, 2025, FoodNet tracked 8 pathogens, including Cyclospora; it now tracks only 2. CNN reported that former CDC Director Robert Redfield, MD, called the cuts contrary to the country's interest, saying surveillance is "the key to early identification"—though CDC and state officials have not said the FoodNet changes have specifically hampered the traceback effort in this outbreak.⁶

What Pharmacists Should Know Now

With community-level transmission uncertainty ongoing, pharmacists can play an outsized role by counseling patients to avoid unpeeled, uncut produce that cannot be effectively washed, reinforcing careful handwashing, and encouraging prompt medical evaluation—including a specific request for cyclosporiasis testing—for anyone with watery diarrhea lasting more than a few days, especially after eating fresh produce. Because routine stool cultures do not detect Cyclospora, patients may otherwise go undiagnosed for weeks.

The CDC and state health departments say case counts will likely continue to rise as reporting catches up with the incubation lag, and both agencies say they will continue updating outbreak pages as the investigation progresses.

REFERENCES

1. Surveillance of cyclosporiasis. CDC. Updated July 13, 2026. Accessed July 14, 2026. https://www.cdc.gov/cyclosporiasis/php/surveillance/index.html

2. Chuck E, et al. Cyclospora map: See US states with the most diarrhea parasite cases. TODAY/NBC News. Updated July 14, 2026. Accessed July 14, 2026. https://www.today.com/health/disease/cyclospora-map-states-parasite-outbreak-diarrhea-2026-rcna385837

3. Infectious disease outbreaks: Cyclosporiasis outbreak in Southeast Michigan. Michigan Department of Health and Human Services. Updated July 13, 2026. Accessed July 14, 2026. https://www.michigan.gov/mdhhs/keep-mi-healthy/infectious-diseases/infectious-disease-outbreaks

4. Six questions answered about the current cyclospora outbreak by a TXST microbiology and virology specialist. Texas State University Newsroom. Published early July 2026. Accessed July 14, 2026. https://news.txst.edu/faculty-experts/2026/six-questions-answered-about-the-current-cyclospora-outbreak.html

5. Lettuce the source of Michigan cyclosporiasis outbreak, test results show. Detroit News. Published July 13, 2026. Accessed July 14, 2026. https://www.detroitnews.com/story/news/local/michigan/2026/07/13/lettuce-michigan-cyclosporiasis-outbreak-test-results-show/90906894007/

6. Sun LH. Michigan says diarrhea outbreak may be linked to lettuce, salad greens as cases rise above 3,000. CNN. Published July 13, 2026. Accessed July 14, 2026. https://www.cnn.com/2026/07/13/health/cyclospora-parasite-diarrhea-outbreak-increase

7. Sun LH. Authorities investigate Taco Bell and lettuce as cyclosporiasis outbreak surges. Washington Post. Published July 14, 2026. Accessed July 14, 2026. https://www.washingtonpost.com/health/2026/07/14/authorities-investigate-taco-bell-lettuce-multistate-cyclosporiasis-outbreak/