A major outbreak of cyclosporiasis is ongoing, with more than 1,600 confirmed cases. But most cases of diarrhea in the U.S. are caused by something other than Cyclospora.

Over 800 cases of cyclosporiasis have been confirmed in more than 30 US states, with health officials investigating the source.

Centers for Disease Control and Prevention says they are scouring food supply chain for culprit, which may be lettuce