US cyclospora outbreak surpasses 4,100 confirmed cases as Taylor Farms recall and FDA false positive fuel confusion

Outbreak reaches historic scale

The Centers for Disease Control and Prevention confirmed on Tuesday that 4,173 domestic cyclosporiasis cases have been recorded across 41 states since May 1, with an additional 767 infections linked to international travel. The agency is investigating more than 7,400 suspected cases, and 308 people have been hospitalized. No deaths have been reported. The previous annual record was 4,703 combined domestic and travel-related cases in 2019; the CDC has averaged about 2,800 cases per year since 2016.

State-level data paints an even steeper picture. Michigan health officials reported 6,148 cases on Tuesday, an 85 percent jump from the prior week and far above the state's typical 50 annual infections. North Carolina recorded an 83 percent spike over the same period, while Indiana's count climbed 150 percent. The Independent's analysis of state and federal figures puts the nationwide total above 10,000, though the CDC cautions that a six-week reporting lag means official numbers will continue to rise.

We assume a 6-week reporting lag between illness onset and case reporting to CDC; therefore, we anticipate that case counts will continue to rise as data are received.

A lettuce recall and a disputed origin

On July 17, California-based Taylor Farms voluntarily recalled iceberg lettuce grown in central Mexico and shipped to 27 states. The CDC has linked at least 1,644 cases in Michigan, Ohio, West Virginia, Indiana and Kentucky to shredded iceberg lettuce from the company. Mexican Secretary of Health David Kershenobich pushed back on Tuesday, stating that investigators in Guanajuato have found no evidence the outbreak began there.

So far, no evidence has been found to indicate that it originated there.

The FDA's messaging has swung sharply. On Saturday the agency said a sample of Taylor Farms lettuce tested positive for Cyclospora cayetanensis. By Sunday it declared the result a false positive after re-reviewing the data. On Monday, the FDA reiterated that its supply chain investigation continues to point to the company's Mexican facilities. Donald Prater, the acting deputy commissioner for food, said the reevaluation does not alter the data supporting the outbreak advisory that prompted the recall.

Political donations enter the frame

Taylor Farms has spent heavily to support Republican causes. A WIRED analysis of federal filings shows the company gave more than $2 million to conservative groups in 2025, including $1 million to MAGA Inc., a Trump-aligned political action committee. Between 2020 and 2024 it contributed over $1.6 million, with $850,000 going to an anti-regulation PAC tied to the Koch brothers network. Chairman and CEO Bruce Taylor personally donated nearly $1 million to Republican PACs and candidates since 2020.

The Department of Health and Human Services addressed online speculation that past support was influencing the administration's response, writing on X that "nothing influences our decisions except science and the safety of the American people." Taylor Farms told The New York Times it had met with White House and FDA officials to discuss what it called "shortfalls in the F.D.A. and C.D.C.'s outbreak response process."

Why the test result flipped

Experts say false positives are not unusual for Cyclospora. Kalmia Kniel, a microbiologist at the University of Delaware, explained that the parasite is one of the most difficult pathogens to detect in produce because very few oocysts are typically present and other food compounds can interfere with testing. The assay may also pick up DNA from microbes that resemble Cyclospora. John Guzewich, who worked on foodborne outbreak investigations at the FDA from 1997 to 2011, noted that the agency may have tested a portion of the lettuce lot where the parasite was absent.

Susan Mayne, a former senior FDA official now at the Yale School of Public Health, called the agency's reversal unusual. In more than eight years at the FDA, she said, she could not recall a similar retraction.

I don't remember any occasion where a similar retraction occurred.

What comes next

Health officials expect case counts to keep climbing through August. The CDC's Health Alert Network noted that many infected people never seek testing, so the true number of infections is likely far higher than confirmed figures. The recall has left consumers with little guidance on how to identify whether they purchased the affected lettuce, and federal experts caution that other foods may still be implicated. Under the second Trump administration, FoodNet made cyclospora tracking optional, though the CDC says the change had no impact on this season's surveillance.