Overview of Parasite (2026)
This Today Explained episode breaks down a large U.S. outbreak of cyclospora, a foodborne parasite causing severe gastrointestinal illness, with the biggest concentration in Michigan and neighboring Midwest states. Reporter Dylan Scott explains what the parasite is, how it spreads, why the outbreak has grown so quickly, and why public health officials are struggling to keep up. The episode then pivots to a lighter but related food-health story: several Trump administration officials’ enthusiasm for fermented foods like sauerkraut and kimchi.
Cyclospora: What It Is and Why It Matters
What the parasite does
- Cyclospora is a parasite that causes cyclosporiasis.
- Symptoms include:
- Explosive watery diarrhea
- Frequent, prolonged gastrointestinal distress
- Illness can last up to a month, making it especially miserable even though it is not typically fatal.
What it does not do
- It does not usually spread person-to-person.
- It is not being discussed as a deadly pathogen, but rather as a serious foodborne illness that can cause major disruption.
The Current Outbreak in the Midwest
Scale of the outbreak
- Michigan is the epicenter.
- The episode cites more than 4,300 confirmed cases in Michigan, up from about 1,500 just days earlier.
- Doctors believe the real number is likely higher than confirmed case counts.
How unusual it is
- Past outbreaks were much smaller, often only hundreds of cases.
- This one is described as the largest U.S. cyclospora outbreak seen so far and possibly heading even higher.
Likely Source: Lettuce, Bagged Salad, and Taco Bell
Where investigators are looking
- Health officials first suspected lettuce or bagged salad.
- Reporting cited in the episode says CDC and FDA investigators were narrowing in on iceberg lettuce supplied to Taco Bell by Taylor Farms.
Important caveat
- The source was not fully confirmed in the episode.
- There could be multiple outbreaks or multiple contaminated food chains.
Why this happens
- Cyclospora often enters produce through:
- Contaminated irrigation water
- Globalized produce distribution chains
- By the time the food reaches consumers, the contamination can be far removed from where it started.
Public Health Response and Government Gaps
State vs. federal response
- State health departments have been leading the response.
- The CDC appears behind the states in tracking case counts and response.
Why federal tracking lagged
- A hospital epidemiologist in Michigan said the federal government stopped asking states to report cyclospora cases last year, which may have contributed to delayed surveillance.
Broader criticism
- The episode suggests the U.S. has long had weak food surveillance, and current federal staffing/resource cuts likely make response even harder.
- The takeaway: this outbreak may have happened anyway, but weaker public health infrastructure may slow detection and containment.
How to Reduce Risk
Food safety advice
- Wash produce thoroughly, especially leafy greens.
- Heat kills the parasite, so cooked vegetables are safer than raw ones.
- If you want to avoid risk during the outbreak, eating cooked foods or foods not typically associated with raw produce is a safer bet.
The White House Fermented-Food Sidebar
What the second half covers
Reporter Liz Astley-White explains that several Trump administration figures have embraced a diet centered on:
- Steak
- Eggs
- Sauerkraut
- Kimchi
- Other fermented foods
Named as part of this trend:
- Robert F. Kennedy Jr.
- Howard Lutnick
- Sean Duffy
- J.D. Vance
What science says
- Fermented foods do have some evidence behind them:
- Can support digestion
- May help with inflammation
- Could support gut health
- But the episode notes that the more aggressive claims about weight loss or glowing health effects are not strongly established.
- The more controversial part of the “carnivore”/anti-processed-food approach is the emphasis on red meat, which can raise concerns about cholesterol and cardiac risk.
A key distinction
- Fermented foods are not the same as pickled foods.
- Pickled foods are preserved with vinegar, not living bacteria, and the guest notes excessive pickled food intake has been linked in some studies to higher gastric cancer risk.
Main Takeaways
- Cyclospora is causing a major Midwest outbreak, with Michigan hit especially hard.
- The illness is not usually deadly, but it can cause prolonged, severe diarrhea.
- Investigators are looking at iceberg lettuce/bagged salad, with a possible link to Taco Bell.
- The episode highlights weaknesses in U.S. food surveillance and federal public health response.
- On the nutrition side, fermented foods are generally supported by science, but they are not a magic fix—and they are not the same as every trendy “health” food claim circulating in politics.