Food Safety Shock: Cooking Beats Salad

A microscopic parasite is quietly spreading through fresh produce across America, and health officials still cannot tell you which food to avoid.

Story Snapshot

More than 1,645 confirmed cases of cyclosporiasis have been reported across 34 states since May 1, 2026, with thousands more under review by the Centers for Disease Control and Prevention (CDC).
Michigan alone has reported over 2,640 cases and 44 hospitalizations, making it the largest such outbreak in state history.
No single food source has been identified and no recall has been issued, leaving consumers with no clear product to avoid.
Washing produce helps but does not fully remove the parasite — cooking to 158°F is the only reliable kill method.

A Parasite That Has Shown Up Every Summer for 30 Years

Cyclospora cayetanensis is not new. The CDC has tracked cyclosporiasis outbreaks in the United States almost every year since the mid-1990s, typically hitting hardest between May and August. Past outbreaks have been tied to specific imported foods — raspberries, basil, cilantro, snow peas, and mesclun lettuce have all been named in previous cases. The parasite spreads only one way: fecal contamination of food or water. Humans are its only known host.

What makes 2026 different is the scale and the silence around the source. The CDC confirmed 1,645 laboratory-verified domestic cases as of its latest update, and is reviewing more than 5,100 additional cases that may also qualify. Michigan reported 2,640 cases with 44 hospitalizations as of July 13. Ohio, Florida, Texas, and California are among the other hard-hit states. Yet investigators have not pinpointed a single contaminated product. No food has been recalled. That gap between the size of the outbreak and the absence of answers is what makes this one unusual.

What the Parasite Actually Does to You

Cyclospora does not hit fast. The incubation period runs about one to two weeks after exposure, which makes tracing the source extremely difficult. Symptoms include watery diarrhea, stomach cramps, nausea, fatigue, loss of appetite, and weight loss. In some cases, symptoms cycle — they ease up and then return. Most healthy adults recover, but the illness can last weeks without treatment. The antibiotic trimethoprim-sulfamethoxazole is the standard treatment. Doctors must specifically order a special stool test for Cyclospora because standard stool cultures will not detect it.

Lettuce and Salad Greens Are Under Investigation, but Nothing Is Confirmed

Investigators are looking at lettuce and salad greens as a possible source in the current outbreak, according to CNN reporting citing ongoing inquiries. That fits the historical pattern. Salad mixes have accounted for about 10 percent of past Cyclospora outbreaks, while raspberries and basil have historically been the most common culprits. But fitting a pattern is not the same as confirming a source. As of mid-July 2026, the CDC says there is no evidence of a single multistate outbreak linking all current cases together, which suggests multiple contamination events may be happening at once.

Yesterday, I had the opportunity to join my colleague, Dr. David Quimby, @ID_Doc_Quimby for a media interviews to discuss the current Cyclospora outbreak and share practical ways our community can reduce their risk of infection.
While the source of this year's outbreak is still…

— Renuga Vivekanandan, MD, MBA (@RVivekanandanMD) July 15, 2026

That conclusion raises a harder question about oversight. The CDC has faced pointed criticism for being slow to update its public tracking data during this outbreak. The University of Minnesota’s Center for Infectious Disease Research and Policy noted that state-level case counts were running far ahead of what the CDC was publicly reporting. When state health departments are outpacing the federal agency on a fast-moving outbreak, that is a problem worth naming. Timely data saves lives by helping people make informed choices about what they eat.

What You Can Actually Do Right Now

The Food and Drug Administration (FDA) and CDC are consistent on a few practical steps. Wash all fresh produce under clean running water before eating it, even if you plan to peel it. Washing reduces the parasite load but does not eliminate it entirely, so do not treat a rinse as a guarantee of safety. Cooking produce to 158 degrees Fahrenheit kills the parasite completely. Wash your hands with soap and water before and after handling food. Clean cutting boards and knives after contact with raw produce.

Frozen produce has never been linked to a Cyclospora outbreak, which is a meaningful data point if you are weighing risk right now. Fresh herbs, leafy greens, and berries carry the highest historical association with past outbreaks. Until investigators identify a specific product, the practical guidance is to apply extra caution to those categories — wash them well, cook them when possible, and watch for symptoms in the one to two weeks after eating them raw. If you develop persistent watery diarrhea, tell your doctor to test specifically for Cyclospora. The standard test will miss it entirely.