In August 2016 Public Health Seattle King County (PHSKC) investigators learned of a cluster of two diarrheal infections caused by Shiga-toxin E. coli (STEC) associated with Memo's Mexican Food in Seattle. One person ate at the restaurant on August 18 and August 24. The second person ate at the restaurant o August 24. Both persons recovered. No one was hospitalized and no one died.

Laboratory testing determined that both persons had an indistinguishable genetic strain of E. coli O157:H7. Environmental Health specialists identified factors that could have contributed to the outbreak. These included improper cooling, cold holding, reheating of potentially hazardous food and the potential for cross contamination.