How health officials are tracking the cyclospora outbreaks Shredded lettuce is one possible culprit, although it’s highly likely there are other sources of the foodborne illnesses making people sick across the U.S. Cyclospora isn’t as common in the U.S., compared to other foodborne pathogens such as norovirus, salmonella or E. coli. Melanie Moser / CDC / DPDxJuly 17, 2026, 2:17 PM EDTBy Lily AlvinoHealth investigators are racing to get a “genetic fingerprint” of the cyclospora parasite, which is to blame thousands of foodborne illnesses since early May. Cyclospora spreads through human waste, but how it got into America’s food supply is still largely unknown. Just a moment.We are getting your experience ready.