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Short Report: Diminished Susceptibility to Praziquantel in a Senegal Isolate of Schistosoma mansoni

P. G. Fallon School of Biological Sciences, University of Wales, Department of Medical Parasitology, London School of Hygiene and Tropical Medicine, Centre d'Immunologie et de Biologie Parasitaire, Institut Pasteur, Service Regional de St. Louis, Bangor, Gwynedd, United Kingdom

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R. F. Sturrock School of Biological Sciences, University of Wales, Department of Medical Parasitology, London School of Hygiene and Tropical Medicine, Centre d'Immunologie et de Biologie Parasitaire, Institut Pasteur, Service Regional de St. Louis, Bangor, Gwynedd, United Kingdom

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A. Capron School of Biological Sciences, University of Wales, Department of Medical Parasitology, London School of Hygiene and Tropical Medicine, Centre d'Immunologie et de Biologie Parasitaire, Institut Pasteur, Service Regional de St. Louis, Bangor, Gwynedd, United Kingdom

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M. Niang School of Biological Sciences, University of Wales, Department of Medical Parasitology, London School of Hygiene and Tropical Medicine, Centre d'Immunologie et de Biologie Parasitaire, Institut Pasteur, Service Regional de St. Louis, Bangor, Gwynedd, United Kingdom

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M. J. Doenhoff School of Biological Sciences, University of Wales, Department of Medical Parasitology, London School of Hygiene and Tropical Medicine, Centre d'Immunologie et de Biologie Parasitaire, Institut Pasteur, Service Regional de St. Louis, Bangor, Gwynedd, United Kingdom

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There is a recent report of low efficacy of praziquantel (PZQ) treatment of human schistosomiasis in a new Schistosoma mansoni focus in northern Senegal. Biomphalaria pfeifferi snails with patent infections were collected from the area of the focus and transported to the United Kingdom. Groups of mice were infected with cercariae from this Senegalese isolate, or with laboratory-maintained Kenyan or Puerto Rican isolates. In two separate experiments, PZQ was less effective against the parasite from Senegal than against the two other geographic isolates. The reduced susceptibility of S. mansoni to PZQ in infected human populations has important implications for current schistosomiasis control programs.

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