[Serum filariasis due to Loa loa and Mansonella perstans in the continental area of equatorial Guinea. Preliminary results].

For the first time, a parasitologic survey has been carried out in the Niefang District (continental area of equatorial Guinea) within a sample of 829 people aged of more than 10 years. Parasitologic incidence was 27.1 p.c. for Loa-Loa and 66.3 p.c. for Mansonella perstans. Significant differences were noted in the prevalence and in the mean density of microfilariae of both species according to the altitude of the villages surveyed.