Fig. 1.

General overview of the possible distribution channels* by which potentially contaminated producer A salad mix was supplied from Mexico-origin growers and fields (growing lots) through distributor X† to chain A/B restaurants in Iowa, Nebraska, and surrounding states, May–June 2013. (* This flowchart is provided only as an overview of the distribution channels described in the text and associated tables. Accordingly, the channels depicted are not intended to demonstrate product movement to any specific final end point-of-service. † Distributor X did not have a single physical location. Product was delivered directly to the various distribution hubs by producer A.)