OBSERVATIONS ON COMPATIBILITY BETWEEN BULINUS-TRUNCATUS AND SCHISTOSOMA-HAEMATOBIUM IN THE SENEGAL RIVER BASIN

In experiments to determine the compatibility between isolates of Schi stosoma haematobium and Bulinus truncatus from Mall and Senegal, the p arasite isolates were shown to differ in their intermediate host speci ficity. Bulinus truncatus from the Levier and Middle Valleys (Senegal) and the Upper Valley (Mall) of the Senegal River Basin (SRB) were all susceptible to S. haematobium isolated from the urines of children li ving in Tenegue, Office du Niger, Mall. However, none of the B. trunca tus tested was susceptible to a parasite isolated from children living in Mbodiene, a village in the Lower Valley of the SRB, where natural transmission is normally associated with B. globosus. As B. truncatus is widely distributed in the SRB, the possible appearance of a Bulinus -truncatus-borne parasite in the Middle and Lower Valleys should be ca refully monitored.