Key points
- Cyclosporiasis occurs in many countries but is most common in tropical and subtropical regions.
- Cyclosporiasis is less common in the United States. U.S. outbreaks and illnesses have been linked to imported fresh produce contaminated with human poop (feces) containing the parasite
- Travelers should be aware of the risk for cyclosporiasis when going to countries where it is more common.
People at risk
Cyclospora can infect anyone whose food or water is contaminated with human poop (feces) containing the parasite.
Since cyclosporiasis can cause severe diarrhea, children, people with weakened immune systems, and older people may experience more severe illness or complications from dehydration.
Places with increased risk
Cyclosporiasis is most common in tropical and subtropical regions. In areas where researchers have studied cyclosporiasis, the risk of infection is seasonal but the reason for this is not yet known.
Risk to travelers
Travelers can be infected with Cyclospora when visiting areas where cyclosporiasis is common. Review Food and Drink Considerations When Traveling to reduce your risk of infection.
Travelers should also be aware that routine treatment methods for food or water are unlikely to kill Cyclospora.
Risk in the United States
In the United States, most cases of cyclosporiasis occur in spring and summer. The U.S. cyclosporiasis season is May 1 through August 31.
Foodborne outbreaks of cyclosporiasis have been linked to different types of imported fresh produce, including
- Basil
- Cilantro
- Iceberg lettuce
- Mesclun lettuce
- Parsley
- Raspberries
- Snow peas
To date, no outbreaks have been linked to commercially frozen or canned produce.
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