The infections have been traced to romaine grown in the Yuma area, although authorities still have not pinpointed where the contamination took place. One operation grew romaine that inmates at a correctional facility consumed, resulting in eight people infected. But most infections are believed to be linked to chopped romaine.
More than half of all states, 29, confirm having citizens infected with this strain of E. coli. The outbreak began on March 13, and the most recently confirmed case took place on April 25.