[Psychosis: the importance of the migratory factor].

Migration can be considered as a major risk factor for the incidence of Psychotic disorders. It has observed in first and second-generation migrants. French studies provide concordant results. There is an increased risk in migrants from sub-saharian countries. Various hypotheses have been evoked as involvement of infectious agents, genetics and vitamin deficiency. Environmental factors seem to be of major important and more specifically discrimination. The role of protection factor as the social capital can be an interesting perspective to develop specific preventive strategies.