There is a microscopic parasite loose in the American food supply that causes what federal health officials have clinically described as 'explosive diarrhea,' and the FDA announced Thursday that they have now found a second outbreak of it with absolutely no idea where it's coming from. The first outbreak, tied to Taylor Farms iceberg lettuce sourced from central Mexico, has already put 141 people in the hospital. Michigan alone is reporting 7,664 confirmed cases. Summer is great.
What We Know About the Outbreaks (It's Not Enough)
The FDA confirmed Thursday that investigators have opened a traceback on a brand-new cyclospora outbreak. A traceback, for the uninitiated, is when federal officials follow a potentially contaminated food product backwards through the supply chain trying to figure out how it got people sick. The problem is that they have not yet identified what the product even is. The source, the FDA told CBS News, is "not yet identified."
So to recap: there is an active outbreak of a gut parasite, the FDA knows people are getting sick, and they do not yet know from what. That's where we are. The agency said it will "provide updates as they become available," which is the food safety equivalent of "we'll cross that bridge when we come to it."
This new mystery outbreak joins a separate, already-confirmed outbreak that has produced at least 10 cases, plus another outbreak that has technically ended but is still under investigation. Three concurrent cyclospora situations. At the same time. In the United States of America, a country with the world's largest food safety regulatory budget.
Taylor Farms and the Lettuce Nobody Should Be Eating
The big one, the outbreak that started this whole mess, traces back to Taylor Farms and its iceberg lettuce grown in central Mexico. CBS News has been tracking this investigation as it expanded across Michigan, Ohio, Indiana, and Kentucky, among other states. Taylor Farms has since issued a voluntary recall of all iceberg lettuce sourced from that region.
Voluntary recall. Worth sitting with that phrase for a second. The company chose to recall the product. The government did not force them to do it. This is the system working as designed, which raises its own set of questions about the design.
The CDC has confirmed 1,645 cases of cyclosporiasis nationally since May 1. But the agency also flagged that more than 5,100 additional cases are waiting on further analysis before they can be confirmed. Michigan's state health department didn't wait for the federal math to catch up. They told CBS News Detroit on Thursday that their confirmed case count is already at 7,664, a number that makes the CDC's nationally confirmed figure look like a rounding error.
What Cyclospora Actually Does to You
Cyclospora cayetanensis is a single-celled parasite. You cannot see it. You cannot taste it. You cannot wash it off your produce, which the CDC specifically warns will not work. It causes cyclosporiasis, a gastrointestinal illness that hits somewhere between one and two weeks after exposure, meaning by the time you feel sick, you have no memory of what you ate that gave it to you.
The symptoms include watery diarrhea, the kind the CDC describes in its official language as sometimes "explosive," along with nausea, cramping, fatigue, and weight loss. It is treatable with antibiotics, but it tends to last weeks if untreated and can relapse. Cooking kills the parasite. Raw leafy greens, though, do not get cooked. That is, famously, the whole point of salad.
The CDC added a note to its case count that should probably have been the lede of every press release they have put out: "Because cyclosporiasis is often underdiagnosed and underreported, the true number of illnesses is likely higher than what has been reported." So the 7,664 confirmed cases in Michigan might itself be a low estimate of the actual number. Fun summer!
The Government's Response, Such As It Is
The FDA is investigating. The CDC is counting. State health departments are reporting numbers that keep outpacing federal figures. Taylor Farms recalled its lettuce. The agency spokesperson told CBS News the investigation is "active" and updates will come "as they become available."
What is not happening, at least not publicly, is any kind of aggressive push to identify the source of the second outbreak before more people get sick from it. The traceback process is standard procedure, and it does work, eventually. The iceberg lettuce outbreak is proof of that. But it takes time, and in the gap between "we know people are getting sick" and "we have identified the source," people keep eating whatever it is that is making them sick.
The Trump administration has spent the better part of 2025 and 2026 cutting staff and resources at federal health agencies. The FDA and CDC have both seen significant workforce reductions. Whether those cuts have any direct bearing on the speed of this investigation is something the agencies have not addressed. It seems like a reasonable question to ask.
The Dingo Take
Here is the actual situation: it is the summer of 2026, there are at least three simultaneous cyclospora outbreaks in the United States, one of them has no identified source, Michigan alone has nearly 8,000 confirmed sick people, and the federal government's official posture is "we're working on it." The CDC's own confirmed national case count is less than a quarter of what one state is reporting. Either the CDC is dramatically undercounting, or state health departments are overcounting, and given that cyclospora is described by the feds themselves as chronically underreported, you can probably guess which direction the error is running.
Taylor Farms voluntarily recalled the lettuce. Good. Also: this is a company that was sourcing product from central Mexico and distributing it nationally, and the mechanism that stopped the bleeding was the company deciding to stop it. Not a federal enforcement action. Not an emergency order. A voluntary decision. The entire architecture of American food safety is built on a foundation of hoping corporations do the right thing when the heat gets bad enough, and we keep being surprised when the system creaks.
Somewhere out there right now, someone is eating whatever the mystery product in the second outbreak is, and they will not know they are sick for one to two weeks. The FDA will update us "as information becomes available." In the meantime, maybe cook your vegetables. Maybe avoid bagged salad for a while. Maybe ask why the richest country on earth keeps finding out about food contamination outbreaks from the diarrhea count rather than from the supply chain inspection. Those are all valid questions. Nobody in a position of power seems particularly interested in answering them.
