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. 2015 Oct 22;144(9):1807–1817. doi: 10.1017/S0950268815002484

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Fig. 4. — Number of chain A/B restaurant exposures* by dates of dining and timing of corresponding distributor X deliveries of producer A salad mix by production lot codes, May and June 2013. (* Chain A/B restaurant exposure defined as dining reported by a confirmed ill person who recalled exact date of patronage and house salad consumption within 14 days prior to illness onset. † Six Iowa (n = 3), Kansas (n = 2) and Missouri (n = 1) residents reported exposure in Nebraska. One Iowan reported exposure in South Dakota on 13 June. ‡ Ten Iowa residents dined 18–22 June 2013 in five restaurants all probably served by distributor X hubs that had received grower Y/ranch Z/lot S romaine-containing salad mix on both 7 and 10 June for subsequent delivery. § Lot specific restaurant delivery information was not retained by the distributor so only groups of lots reported as being delivered in shipments. ¶ For product shipped both 7 and 10 June, grower Y/ranch Z/lot S romaine-containing products were shipped from producer A to distribution hubs in Nebraska, Iowa, and Illinois (Table 4). Restaurant-specific delivery information was not available for the Iowa or Illinois hubs to definitively link product to reported exposures. However, grower Y/ranch Z/lot S romaine was supplied by the Nebraska hub on both 14 and 17 June to an Iowa chain A/B restaurant where one confirmed ill Iowan reported exposure on 18 June 2013. # For salad-mix product shipped on 14 June, no restaurant-specific delivery information was available except for the Nebraska hub. However, grower Y/ranch Z/lot S romaine-containing salad-mix product had been shipped by producer A for subsequent delivery from hubs in Nebraska, Iowa, Wisconsin, and Illinois. The Missouri hub also received a slightly larger amount from this shipment than each of the other distribution hubs but romaine grower was unknown. ** For product shipped on and after 17 June, no restaurant-specific delivery information was available. However, grower Y/ranch Z/lot S romaine was no longer included in any producer A salad-mix shipments.