[Epidemiologic and parasitologic survey concerning the Hassan Addakhil dam and branches to the Tafilalet province...

In conclusion we know human and animal gathering is usually required for the development of water invertebrate populations, and particularly Bulinus contortus or Culicidae larvae, in a water system polluted with excrements or sewage. Such conditions are not those of Hassan Addakhil lake and the latter is not to-day, on its surface, a source of contamination. As we report p. 486, the study of an eventual increase of malaria and bilharzia endemia due to new aval more or less distant irrigations, belongs to the control of the Hygiene Institute of Morocco and collaborators of physicians of the Tafilalet province. This item will be discussed later on.