Cyclosporiasis cases reach 843 across 31 states as investigators seek source

At least 843 people in 31 states have contracted cyclosporiasis as of July 9, according to CDC data, with separate state reports pushing the total above 1,000. The illness is caused by the Cyclospora parasite and produces symptoms including explosive diarrhea. Cases have historically been linked to fresh produce such as herbs and lettuce.

Reporting changes affect tracking Last year the CDC ended mandatory reporting of Cyclospora cases to the Foodborne Diseases Active Surveillance Network, known as FoodNet. Kalmia Kniel, a professor of microbial food safety at the University of Delaware, said the change leaves investigators with less data to identify patterns.

The FDA stated it is investigating current outbreaks using epidemiologic, laboratory, and traceback methods in coordination with CDC and state partners.

Water examined as possible transmission route Former FDA Deputy Commissioner Frank Yiannas said water may be an underestimated source of contamination. He noted past outbreaks where irrigation canals carried the parasite to crops. Former USDA official Robert Mandrell said Cyclospora resists chlorine treatment used in municipal water systems.

He added that recent flooding in Michigan and Ohio could have spread contaminated water into fields and recreational areas. Yiannas said FDA outbreak questionnaires still did not include questions about water exposure as of July 6.