Risk of infection from E. coli O157:H7 through informally marketed raw milk in Kenya - Arimi, S.M.; Koroti, E.; Kang'ethe, Erastus K.; Omore, Amos O.; McDermott, John J.; Macharia, J.K.; Nduhiu, J.G.; Githua, A.M. (Smallholder Dairy Project, 2000)