"The symptoms began approximately one week after exposure, consistent with CDC data on the incubation period."
Honeymoon in Yellowstone Turns Into Health Scare After Parasite Outbreak
A Wisconsin resident, Gretchen Pleuss, was hospitalized during her honeymoon at Yellowstone National Park after developing cyclosporiasis. The illness has been linked by the U.S. Centers for Disease Control and Prevention (CDC) to a larger outbreak associated with shredded iceberg lettuce from central Mexico.
Background and Timeline
According to multiple reports, Pleuss experienced symptoms including severe abdominal pain and diarrhea, which prompted an emergency room visit. She tested positive for cyclosporiasis, an infection caused by the Cyclospora parasite. The symptoms began approximately one week after exposure, consistent with CDC data on the incubation period.
Pleuss stated her belief that the infection resulted from shredded lettuce in a sandwich. Despite the illness, she and her husband are continuing their honeymoon.
CDC Data
The CDC has confirmed 1,644 cases of cyclosporiasis across five states, with 94 hospitalizations. The agency also reported over 5,100 potential cases that require further analysis.
Industry Response
Taylor Farms de Mexico voluntarily removed all iceberg lettuce sourced from central Mexico from the U.S. market. Taco Bell removed affected lettuce from its restaurants as of July 17, 2025.
Symptoms
According to the CDC, primary symptoms of cyclosporiasis include:
- Watery or explosive diarrhea
- Fatigue
- Loss of appetite
- Abdominal pain
Symptoms typically begin about one week after exposure to the parasite.