Prevention

Mysterious Stomach Illness Outbreak Spreads Across US

By Rachel Adler · Jul 5, 2026

Tracing the Source of Contamination

Cyclospora, a parasite causing severe stomach cramps and diarrhea, has infected over 400 people in 18 states. The Centers for Disease Control and Prevention is investigating the outbreak. At least 20 people have been hospitalized, with no reported deaths. The cases are scattered across the country.

The parasite is transmitted through contaminated food and water, often with feces. Cyclospora infections typically surge in May and June, but this year's numbers are unusually high. The CDC is working with state health departments to identify the source of the outbreak.

Investigators are examining various food and water sources to pinpoint the cause. Cyclospora can be difficult to detect, as symptoms may take weeks to appear. The CDC is urging healthcare providers to test patients with severe gastrointestinal symptoms.

Is Food the Likely Culprit?

The outbreak is widespread, with cases reported in states from California to New York. Health officials are working to determine if a single contaminated food or water source is responsible. So far, no common link has been identified.

Cyclospora outbreaks have been linked to contaminated produce in the past. The CDC is focusing on foodborne transmission as a potential cause. If a specific food is identified as the source, a recall may be issued.

The outbreak is expected to continue being monitored closely by health officials. As more cases are reported, investigators will refine their search for the source.

Frequently Asked Questions

What are the symptoms of cyclospora infection? Symptoms include stomach cramps, nausea, vomiting, and severe diarrhea. They can take up to two weeks to appear.

How is cyclospora infection treated? Treatment typically involves antibiotics, and symptoms usually resolve within a few days.

Can cyclospora infection be prevented? Prevention involves avoiding contaminated food and water, and practicing good hygiene, such as frequent handwashing.