Cyclosporiasis: What You Should Know

Cyclosporiasis is an intestinal infection caused by the parasite Cyclospora cayetanensis. It is usually acquired by eating or drinking food or water contaminated with the parasite, most commonly fresh fruits, vegetables, and herbs. It is not typically spread directly from person to person.

Symptoms

Symptoms usually begin 2–14 days after exposure (typically about 1 week) and may include:

  • Watery diarrhea (may come and go)
  • Stomach cramps or bloating
  • Nausea or vomiting
  • Loss of appetite or weight loss
  • Fatigue or weakness
  • Low-grade fever
  • Increased gas

Contact your provider if you have:

  • Diarrhea lasting more than 2–3 days or severe diarrhea
  • Signs of dehydration (dry mouth, dizziness, dark urine, decreased urination)
  • Blood in your stool
  • Fever of 101.5°F (38.6°C) or higher
  • Severe abdominal pain
  • Persistent vomiting
  • Symptoms that do not improve or keep returning

Seek emergency care if you have severe dehydration, confusion, fainting, or are unable to keep fluids down.

Diagnosis

Cyclosporiasis is diagnosed with a stool test. Tell your healthcare provider if you have recently traveled internationally or eaten fresh produce that may have been contaminated.

Treatment

Cyclosporiasis is treated with prescription antibiotics. Most people begin to feel better within a few days of starting treatment. Your provider may also recommend:

  • Drinking plenty of fluids
  • Replacing electrolytes if needed
  • Getting adequate rest
  • Avoiding anti-diarrheal medications unless directed by your provider

Prevention

You can lower your risk by:

  • Washing your hands with soap and water before eating or preparing food and after using the bathroom.
  • Rinsing fresh fruits and vegetables under running water before eating them.
  • Drinking safe, clean water, especially while traveling.
  • It’s safer to purchase whole lettuce/greens, rather than bagged, and discard the outer leaves.

If you have diarrhea, avoid preparing food for others until your symptoms have completely resolved.

Reference

Centers for Disease Control and Prevention. (2024). Clinical overview of cyclosporiasis. U.S. Department of Health and Human Services.