date:Mar 31, 2014
tated that studies on the prevalence and infectivity of norovirus are limited, and quantitative data on viral load are scarce, making establishment of microbiological criteria for norovirus on leafy greens difficult.
Main risk factors cited were: environmental factors such as proximity to animal-rearing operations, heavy rainfall causing floods, contact with domestic or wild animal reservoirs, use of untreated or insufficiently treated manure or compost, use of contaminated agricultural water f