| quantification of the health risk associated with wastewater reuse in accra, ghana: a contribution toward local guidelines. | quantitative microbial risk assessment (qmra) models with 10,000 monte carlo simulations were applied to ascertain the risks of rotavirus and ascaris infections for farmers using different irrigation water qualities and consumers of lettuce irrigated with the different water qualities after allowing post-harvest handling. a tolerable risk (tr) of infection of 7.7 x 10(-4) and 1 x 10(-2) per person per year were used for rotavirus and ascaris respectively. the risk of ascaris infection was within ... | 2008 | 18401111 |