Don't Blame the Pool: Cyclospora Strikes Via Produce

Investigators are examining fresh produce as the likely cause of a recent surge in cyclospora infections across parts of the U.S. While it's possible to contract parasites from water activities like swimming pools, cyclospora is not commonly associated with these exposures. Cryptosporidium, or 'crypto,' is the more frequent culprit in waterborne illnesses.

The U.S. Centers for Disease Control and Prevention is investigating an increase in cases, with early indications pointing towards lettuce or salad greens as a potential source. Other food items have not been entirely ruled out, but no specific grower or supplier has been identified as of 2026.

Cyclospora infections can cause severe diarrhea and have been linked to hospitalizations, though no deaths were reported in 2026. Transmission occurs through the fecal-oral route, typically via contaminated food or water. Chlorine in pools does not kill the cyclospora parasite, and infection requires ingesting contaminated water, a less common transmission method than foodborne exposure.

Public health advice primarily focuses on produce safety, urging the public to practice good hygiene and be aware of potential contamination sources. While general precautions to avoid swallowing recreational water are advised, the current outbreak investigation's primary focus remains on contaminated produce.