Ag Minute: How the U.S. Tracks the Foods That Make Us Sick
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Cyclospora is having a very big summer in the United States. More than 6,700 laboratory-confirmed cases have been reported this year, with hundreds of people hospitalized, and the number continues to climb. For most Americans, Cyclospora was a parasite they had never heard of before this outbreak. That is part of what makes the story so interesting. The U.S. has built one of the most sophisticated food-safety systems in the world, with inspectors, laboratories, epidemiologists and an increasingly connected web of traceability working from the farm to the grocery store and restaurant. Yet when thousands of people across the country begin getting sick from a microscopic parasite, figuring out exactly where it came from can still be remarkably difficult. So how does the United States actually track foodborne illness, and what happens when that system finds a problem?
The system was not built overnight. In the early 1900s, Americans had little idea what was actually in their food, and meatpacking conditions were bad enough to inspire Upton Sinclair’s The Jungle. The public backlash helped lead Congress to pass both the Pure Food and Drugs Act and the Federal Meat Inspection Act in 1906. Meat inspection continued to evolve from primarily detecting visible defects toward systems designed to prevent microbial contamination before it reached consumers. In 1996, USDA’s Food Safety and Inspection Service implemented Hazard Analysis and Critical Control Points, or HACCP, requiring meat and poultry processors to identify where hazards could occur and build controls into their processes. Produce followed a different regulatory path, but the philosophy increasingly became the same: don’t just find unsafe food after the fact, prevent it from becoming unsafe in the first place.
That brings us to today, where food safety is less about a single inspector standing over a production line and more about a nationwide network of surveillance, testing, prevention, and traceback. The FDA’s Food Safety Modernization Act, passed in 2011, was a major shift toward preventing contamination before it happens. Its rules cover everything from produce safety and agricultural water to preventive controls, foreign suppliers, sanitary transportation and food traceability. When something does go wrong, the CDC, FDA, USDA, state health departments and industry can work backward from sick consumers to identify common foods and ultimately their source. We have seen this system evolve through outbreaks. A 2018 E. coli outbreak linked to romaine lettuce sickened 210 people and hospitalized 96, prompting a nationwide warning and a massive traceback that eventually narrowed the likely source to the Yuma growing region. Later investigations found potential contamination pathways involving agricultural water and nearby cattle operations, leading to additional research and prevention efforts around leafy greens. Meanwhile, advances like whole-genome sequencing allow investigators to compare the genetic fingerprints of pathogens from sick people and link outbreaks that otherwise might look like unrelated illnesses.
And that brings us to Cyclospora. As of late July, more than 6,700 laboratory-confirmed cases had been reported nationwide, with more than 400 hospitalizations. The parasite is different from the bacteria that dominate many food-safety headlines, and that difference matters. Cyclospora is generally spread when food or water becomes contaminated with human fecal material, and fresh produce has been associated with previous outbreaks. It is difficult to detect, because the parasite is not routinely identified through the standard stool testing used for many other foodborne pathogens. In the current outbreak, epidemiological interviews and supply-chain traceback have pointed investigators toward shredded iceberg lettuce served at Taco Bell and supplied by Taylor Farms de Mexico. But investigators have not established that lettuce as the definitive source of the broader national outbreak, and laboratory testing has not confirmed Cyclospora in the implicated lettuce. That distinction is important: investigators have found a strong lead, but they are still trying to determine exactly how and where contamination occurred.
The question now is what we learn from it. The FDA already has a Cyclospora action plan that calls for better prevention, faster outbreak response, improved traceability and more research into the parasite. But the current outbreak has renewed calls for stronger disease surveillance, better agricultural-water controls and faster farm-to-fork traceability. The timing is particularly interesting because the FDA’s Food Traceability Rule, which would require more detailed lot-level records for certain high-risk foods, including leafy greens, has been delayed until 2028. At the same time, CDC’s FoodNet surveillance system was scaled back in 2025, making participation in active surveillance for Cyclospora optional for participating health departments rather than universally required through FoodNet.
America’s food system is not perfect, and Cyclospora is a reminder of that. But the more important story may be what happens after an outbreak is discovered. A century of food safety regulation has taught us that every outbreak is an opportunity to identify a weak link, improve the system and make the next outbreak smaller, faster to detect, and easier to trace. The U.S. still ranks among the world’s strongest food systems for food quality and safety, and consumers benefit from that infrastructure every day, often without thinking about it. Food safety is not about promising that nothing will ever go wrong. It is about building a system capable of finding out when something does, figuring out where it came from, getting it off the shelf, and learning enough to keep it from happening again.
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