The McDonald’s cyclospora outbreak was the number one outbreak of 23018, with 511 people in 16 states sickened. Twenty four people were hospitalized because they were so sick
Epidemiologic and traceback evidence found that salads purchased from McDonald’s were “one likely source of this outbreak.” The FDA did not name other sources.
On July 26, 2018, the FDA completed analysis of an unused package of romaine lettuce and carrot mix that was distributed to McDonald’s by the Fresh Express processor in Streamwood, Illinois. They confirmed the presence of the cyclospora parasite in the sample. However, the FDA did not identify a single source of point of contamination for this outbreak.