| multistate product traceforward investigation to link imported romaine lettuce to a us cyclosporiasis outbreak - nebraska, texas, and florida, june-august 2013. | during june-august 2013, 25 us states reported 631 cyclosporiasis cases including nebraska and iowa where a regional investigation implicated common-source imported salad mix served in two chain restaurants. at least two common-origin growing fields were likely sources of contaminated romaine lettuce. using producer- and distributor-provided data, we conducted a grower-specific traceforward investigation to reveal exposures of ill us residents elsewhere who reported symptom onset during 11 june- ... | 2016 | 26489400 |