Los Burritos Mexicanos, 1015 E. St. Charles Road in Lombard, was closed June 14 and reopened last week while investigators continue to try to track the cause of the outbreak.

The most recent tally of people who were made ill during the outbreak was 31, including confirmed and probable cases of E. coli O157:H7, according to Jason Gerwig, a spokesman for the DuPage County Health Department. Several people were hospitalized.