[Hypotheses on the origin of certain parasites on the Latin American continent].

The South American continent has been connected to Africa over millions of centuries. In prehistorical time, the filling of the Bering strait allowed passage on firm ground between Asia and North America. South American peopling has thus occurred from North America, through the Pacific sea and, from the 15th century A.C., through the Atlantic. Necator americanus was present in South America prior to the arrival of black slaves and its African origin is probably related to contacts between Africa and South America; the same applies to Leishmania donovani and Biom-Phalaria glabrata. Ankylostoma duodenale originates from Asia as well as Plasmodium falciparum which was brought by man at time of his migration. To the contrary, muco-cutaneous Leishmaniasis stem (or have a South American origin) from South America. Finally, it is difficult to understand for which reasons Loa loa has not established itself in South America as did Schistosoma mansoni.