By Ethan Covey
A large, multistate outbreak of Escherichia coli O157:H7 infections has been traced to food eaten at a national fast-food chain.
However, an investigation into the outbreak has demonstrated the challenges faced when trying to appropriately identify the source of outbreaks linked to single restaurant chains, according to the epidemiologists, who did not name the restaurant (MMWR Morb Mortal Wkly Rep 2023;72[26]:732-733).