USE OF A MOLLUSCICIDE IN CONJUNCTION WITH CHEMOTHERAPY TO CONTROL SCHISTOSOMA HAEMATOBIUM AT BAROMBI LAKE FOCI IN CAMEROON .3. CONCLUSIONS AND COSTS

Abstract

Although Frescon successfully controlled snails on the margins of the Barombi lakes, and although the continuation or niridazole and Frescon control reduced transmission of S. haematobium considerably, practical difficulties, which are discussed, rendered the twin goals of snail- and parasite-eradication impossible to achieve. The break-point in transmission of S. haematobium appears to lie so low as to be practically synonymous with total eradication. Control operations would thus have to be maintained indefinitely to avoid a rapid return to the pre-control situation. The cost of the control element in this combined chemotherapeutic and molluscicidal research project, at 2 lacustrine foci of S. haematobium transmission in the United Republic of Cameroon, was 9-10 USA dollars/yr per head of population protected. This sum is about 3 times the country''s total estimated expenditure per head of population on all health and social services for the year 1974-1975. The high cost of such operations is only likely to be acceptable where schistosomiasis causes much ill-health and reduced economic productivity, and where tangible benefits may be expected from a reduction in the intensity of infections, short of eradication.