2.2.2. Risk assessment from consumers
The risk more proven meets at the time of the consumption of
lettuce is the C+TW treatment where Salmonella risk infection is
1.54x10-1, then GW treatment (9.42x10-4). Infection of
risk from C+TW is higher than WHO recommendations (10-6). This high
value could be explained by the fact that, compost was not mature before use to
spread in the field. Therefore, when they irrigate the crop microorganisms may
be regrow and then tosettle on the lettuce leaves thanks to the water drops(FAO
and WHO, 2008). From GW, risk could be reduced if last irrigation before
harvest must be considered (2 days) according to Shuval et al., (1997) and
WHO, 2006a.Ascaris annual risks of infection C+TW and C+U+GW are
equal (4.67x10-2), however, this probabilistic values are higher
than WHO guideline values (2006). Risk could be reduced thanks to
recommendation above given by WHO, (1998) concerning conservation of foods.
Furthermore, according to Shuval et al., (1997), pathogens attached to plants
will be inactivated withtime due to natural attrition and the effects of
desiccation, UV irradiation, heat and biological competition.
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