A parasite outbreak tied to Taco Bell has sickened at least 1,645 people across 34 states since May. Of those, 141 ended up in the hospital. None have died. The CDC linked the outbreak to shredded iceberg lettuce from a single central Mexico farm run by Taylor Farms de México — served at Taco Bell locations in five Midwest states. Taylor Farms voluntarily recalled the lettuce on July 17. Then the FDA reported a positive lab test on a lettuce sample — and two days later retracted it, calling it a "false positive." As of July 19, no product sample has confirmed cyclospora contamination. The recall stays in place.

1. Sick Patients Are the Evidence (FDA, Don Prater)

The FDA says it doesn't need a confirmed lab test to know what made people sick.

Ninety percent of sick patients ate the same lettuce. The investigation rests on that patient data, not on a lab result. Don Prater, FDA's acting deputy commissioner for food, said cyclospora "cannot be cultured with conventional laboratory techniques" and is "extremely difficult to detect" in food samples even when it's there. The false positive was a technical error on a border screening sample, separate from the investigation into how sick patients were exposed.

The recall was never built on that lab test. FDA said the retraction "does not change the basis for FDA's ongoing outbreak investigation or the overwhelming epidemiological data supporting the current voluntary recall." Donald Schaffner, chair of the food science department at Rutgers University, backed that call. He said the recall was "the right thing" regardless of the test, and that the FDA "showed courage in admitting it was wrong."

2. But No Lab Test Means No Proof (Taylor Fresh Foods)

Taylor Farms says the FDA got it wrong and still has nothing confirmed on their products.

The only test run came back wrong. The FDA acknowledged it. Taylor Fresh Foods said the agency "apologized" for the false positive. The FDA disputed the word "apologized," saying it "notified" Taylor Farms instead. Both sides agree the test was bad. As of July 19, there is "not a single positive product test result for Cyclospora" linked to Taylor Farms, per the company.

The retail salad kits on grocery shelves aren't part of this recall. Taylor Fresh Foods says its branded salad kit products don't contain iceberg lettuce from the supply chain in question. The recall covers only Taylor Farms de México's bulk iceberg supply to Taco Bell. The company voluntarily stopped sourcing iceberg from central Mexico for the rest of the season. Its position is that it cooperated before any evidence confirmed the contamination.

3. The Counting Stopped Before the Outbreak Did (Bill Marler)

Food safety critics say the false positive fight is obscuring a much bigger failure: the CDC stopped counting.

Michigan alone has confirmed more than 6,000 cases. The CDC's national count is 1,645. Food safety attorney Bill Marler, who filed the first lawsuit in this outbreak on behalf of a sick Taco Bell customer, says that gap explains the story. "The outbreak isn't slowing down," he wrote. "The counting is." In July 2025, the CDC cut its FoodNet active surveillance program from eight mandatory pathogens down to two. Cyclospora went from mandatory to optional for states to report — after mandatory tracking had been in place since 1997.

You can't find a bug you've stopped counting. Marler argued: "You do not find a bug like that by hoping 'other systems' catch it. You find it by actively counting." Thomas Gremillion, director of food policy at the Consumer Federation of America, noted that cyclospora doesn't appear on routine stool panels — it takes a specific request. Without mandatory tracking, clusters go unspotted until emergency rooms are already seeing a surge.

Where This Lands

The FDA and the public health community say the patient data is too consistent to dismiss: 90% of sick people ate the same lettuce, and cyclospora is so hard to detect in food samples that a missing lab result doesn't clear the supply chain. Taylor Farms disputes the attribution. The company points out that the FDA retracted its only positive test and still has no confirmed lab evidence linking their products to the outbreak. Marler and food safety critics say both arguments miss the point. The CDC cut the mandatory surveillance that would have shown how large this outbreak actually grew — and Michigan's 6,000-plus confirmed cases, nearly four times the CDC's national count, is the proof.

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