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July 7, 1945


JAMA. 1945;128(10):750. doi:10.1001/jama.1945.02860270052025

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To the Editor:—  Thirty years' close study of the control of schistosomiasis in Africa forces me to the conclusion that the natural enemies of snail hosts such as water beetles, river crabs, birds and lizards should be preserved, that chemicals interfering with wild life along the course of rivers should be avoided and that the present attacks on the iguana by natives and others should be controlled.A steady infection among the natives in spite of improved education in places where chemicals have been used either to destroy the snail hosts or for mosquito control shows the mistake of such official efforts and adds interest to the effectiveness of removing river rushes and treating native carriers in other districts. Further use might well be made of burning cane or covering in portions of polluted streams occasionally, in view of the importance of small and easily overlooked snail hosts.Increased efforts

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