Delft, The Netherlands, 19-21 November 2008 Particular care must be taken when extrapolating results from pilot projects of a few hundred households to whole cities, due to the institutional complexities that arise and the sheer volume of sewage 90.65 Kb. 1
On the basis of the matched case-control study, infection with Obtaining water from a tap outside the home and eating food obtained from street vendors were also associated with illness. Using boiled water in the home and eating butter, apples, or onions were determined to be protective factors 170.92 Kb. 2