Median norovirus infection risks from the consumption of 10–51 g of wastewater irrigated lettuce on 2–4 days per week estimated by 10,000 Karavarsamis- Hamilton MC simulations.

Assumptions: 0.1–1 norovirus per 105E. coli, disease/infection ratio 1:1.† Median irrigation water contamination or mean produce/salad contamination‡Maximum E. coli contamination*No pathogen reduction for prepared salad at restaurants and street kitchensMedian norovirus infection risks from the consumption of 10–51 g of wastewater irrigated lettuce on 2–4 days per week estimated by 10,000 Karavarsamis- Hamilton MC simulations.