Shehata, MA


Field Studies on Schistosomiasis in Zambia: I: Seasonal Fluctuations in the Population Density of Biomphalaria pfeifferi and Bulinus (physopsis) globosus in a Schistosomiasis Endomic Area in Zambia, M.A. Shehata,Zambia Journal of Science & Technology, Vol.8, no.1, September 1989, Pg.36-46.


Previous work done on Schestosomiasis in Zambia was largely concerned with the medical aspects and little had been made on the bionomics of the snails intermediate hosts. This paper records the results of a detailed study carried out over a one year period on the population density of the two species of snails. The ecology of snail habitat is described; and the data on seasonal fluctuation in the population density of the mollescan hosts (Biomphalaria pfeifferi and Bulinus (physopsis) globosus) in Muchinshi area, Chingola district, Copperbelt Province, are presented and discussed. In flowing waters such as Muchinshi stream, the populations of the two snail species are most dense during the cool dry season (July - August) and fall to their lowest during the rainy season (November -March). Schistosomiasis control programme should take advantage of the finding on population parameters by application of a molluscicide when the habitat has been refilled by rainfall to reduce the population before the snail reproductive season begins.

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