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. 2015 Oct 22;144(13):2709–2718. doi: 10.1017/S0950268815002320

Table 1.

Percent of overall total (100%) of producer A US distribution of grower R/ranch R/lot R romaine or romaine-containing lettuce products by production lot code and product type, 2–6 June 2013

PC June shipping dates Restaurant chain A/B salad mix (%) Chopped romaine (%) Romaine blend (%) Romaine leaf (%) Shredded romaine (%) Percent of each PC in overall total*
L 2–4 0 100·0 0 0 0 16·1
M 3 100·0 0 0 0 0 1·5
O 3 0 100·0 0 0 0 0·3
S 3–5 0 100·0 0 0 0 45·5
T 2–6 20·1 76·4 0 0 3·5 24·6
U 2–4 92·5 0 7·5 0 0 5·6
V 3–4 82·5 0 17·5 0 0 6·2
W 3 0 0 0 100·0 0 0·2
Percent of total … 16·8 80·7 1·5 0·2 0·9 100·0

PC, Production lot code.

*

Numbers in the ‘Percent of each PC in overall total’ column represent the PC-specific proportion of the overall total volume (100%) of grower R/ranch R/lot R romaine or romaine-containing lettuce products processed and shipped by producer A from 2 to 6 June 2013.

Numbers in each row represent the proportion of the various product types out of the total volume for each PC (i.e. denominator = volume represented as percent in the corresponding ‘Percent of each PC in overall total’ column).

Texas and Arkansas both received production code T (PC-T) product which contained romaine lettuce not originating from grower R/ranch R/lot R (9% of all PC-T product in approximate equal volume in both states). However, this product did share the same production line and shift and potentially shared pre-processing wash water thus potential for cross-contamination existed.