Nearly 12,000 Americans are confirmed or suspected to have contracted a fecal parasite from shredded iceberg lettuce this summer, making it the worst cyclospora outbreak in U.S. history by a country mile. The lettuce came from Taylor Farms de Mexico, a produce giant whose supply chain runs straight into Walmart, Target, Whole Foods, and Taco Bell. The outbreak has now spread to nine states and the CDC still isn't sure it has the full picture.
Nine States and Counting
The CDC confirmed Friday that the outbreak has expanded to nine states after Illinois, Kansas, Oklahoma, and Pennsylvania were added to an existing cluster of cases in Indiana, Kentucky, Michigan, Ohio, and West Virginia. The expansion was first reported by the Washington Post and confirmed to CBS News by the Department of Health and Human Services.
The CDC has confirmed 1,947 cases directly linked to the iceberg lettuce outbreak from June 22 through July 20. But that number is almost certainly a severe undercount. The agency has received reports of 4,173 total lab-confirmed domestic cases of cyclosporiasis since May 1, and is sitting on more than 7,400 additional suspected cases that still need further analysis to confirm. State health departments, meanwhile, are reporting numbers that make the CDC's look almost quaint.
Michigan alone has confirmed 7,664 cases as of Thursday, according to state health officials. Ohio, which the CDC considered serious enough to deploy three of its own staffers to assist, has recorded 2,596 cases. The nationwide tally of confirmed and suspected cases is sitting at nearly 12,000. In a normal year, the CDC sees 200 to 1,000 cases total.
The Parasite Hitching a Ride in Your Salad
Cyclospora cayetanensis is a microscopic parasite that spreads through water contaminated with human feces and loves to cling to fresh produce. It causes cyclosporiasis, a gastrointestinal illness featuring symptoms like severe, watery diarrhea, nausea, fatigue, and cramping. Cases can be severe enough to require hospitalization.
Here's what makes it especially nasty from a public health standpoint: symptoms can take weeks to show up after exposure. That delay makes it enormously difficult to trace back to a specific food source, which is part of why outbreaks like this can get so large before anyone figures out what's causing them. By the time someone connects their miserable week of GI symptoms to that Taco Bell run in June, the lettuce is long gone and thousands of other people have already eaten it.
The parasite does not wash off easily, which is why the FDA's standard advice to rinse your produce thoroughly offers limited comfort here. The contamination is in the supply chain, not on your cutting board.
How Taco Bell Cracked the Case
The link to Taylor Farms came the old-fashioned way: health investigators started interviewing sick people and noticed a pattern. According to NBC News, many of the early cases reported eating at Taco Bell in June, before the broader waves of illness hit. Taco Bell pulled lettuce from its menu ahead of Taylor Farms issuing its voluntary recall, and that timing helped investigators work backward to the supplier.
"We know it went to many states, to many points of sale," Kari Irvin, deputy director of the FDA's Coordinated Outbreak Response and Evaluation Network, told NBC News. The FDA is closely monitoring the CDC's confirmed case numbers, she said, to determine whether the recall has actually pulled all the contaminated product off the market.
Taylor Farms is not a minor player here. The company is one of the largest produce suppliers in the country, moving shredded lettuce and other products to retailers including Walmart, Target, and Whole Foods. The voluntary recall covers all iceberg lettuce sourced from central Mexico.
This Almost Certainly Isn't Just the Lettuce
The FDA is being careful not to declare the Taylor Farms lettuce the only culprit, and for good reason. Hundreds of cases have been reported in states not connected to the nine-state lettuce cluster. New York has logged 632 cases since May. North Carolina has reported 561 cases in the same window, and preliminary investigations there point toward parsley and cilantro as the likely vehicles, according to NBC News.
Irvin told NBC that the FDA currently has "multiple investigations of cyclospora open" and has detected different outbreak signals suggesting more than one contaminated product and possibly more than one supply source. The FDA is working to determine whether additional growers beyond those already identified played a role, though Irvin said the data continues to "home in on growers that were already identified."
CDC deputy director Gwen Biggerstaff tried to offer some context to NBC News, emphasizing that the expansion to four more states doesn't necessarily mean cases are accelerating. "States are completing interviews with people, and we're filling in the data," she said. Which is a reasonable thing to say, and also does not change the fact that we're looking at nearly 12,000 people sick from a fecal parasite in a single summer.
What You Should Actually Do Right Now
Taylor Farms has voluntarily recalled all iceberg lettuce sourced from central Mexico. If you have shredded iceberg lettuce at home and you're unsure of its origin, the conservative move is to throw it out. Check the packaging for Taylor Farms branding or any indication it came from Mexico.
If you've had severe diarrhea, fatigue, nausea, or cramping in the past few weeks and haven't seen a doctor, go see a doctor. Cyclosporiasis is treatable with antibiotics, specifically trimethoprim-sulfamethoxazole, but it doesn't clear up on its own quickly. And given how long the incubation period can run, people who ate contaminated produce in June may still be experiencing symptoms or only just starting to develop them now.
The Dingo Take
Let's be clear about the scale of what is happening. The United States is currently experiencing the worst cyclospora outbreak in recorded history. Nearly 12,000 people are sick. Michigan, a single state, has more confirmed cases than the entire country sees in a bad year. The parasite that is making all of these people violently ill spreads through fecal contamination of water, found its way onto shredded iceberg lettuce processed in Mexico, and then traveled through one of the country's largest produce suppliers into Walmart, Target, Whole Foods, and Taco Bell locations across nine states. This is a total systems failure, dressed up in the polite language of a "voluntary recall."
Taylor Farms gets to call this voluntary. The FDA gets to say investigators are "working to determine" whether additional growers played a role. The CDC gets to say they're "filling in the data." And meanwhile, thousands of people who ate a salad or a taco are spending their summer on the bathroom floor. The gap between the CDC's confirmed case count of 1,947 linked to the outbreak and Michigan's state-level count of 7,664 cases on its own is not a rounding error. It is a giant flashing sign that the federal surveillance and reporting systems are working at a fraction of the speed the actual outbreak is moving.
This is also a story about supply chain consolidation, though no one wants to say it that plainly. When one company supplies shredded lettuce to Walmart, Target, Whole Foods, and Taco Bell simultaneously, a single contamination event becomes a nine-state outbreak. That is not bad luck. That is the entirely predictable consequence of centralizing the food supply to maximize efficiency and cut costs. Someone made a lot of money on that efficiency. The 12,000 people currently sick are paying the tab.
