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A Comparative Study of Some Combined Treatment Regimens in Acute Toxoplasmosis in Mice

Erica ThiermannUnit of Parasitology, Department of Pre-Clinics and Medicine, West Faculty of Medicine, and Unit of Parasitology, Department of Experimental Medicine, South Faculty of Medicine, University of Chile, Santiago, Chile

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Werner AptUnit of Parasitology, Department of Pre-Clinics and Medicine, West Faculty of Medicine, and Unit of Parasitology, Department of Experimental Medicine, South Faculty of Medicine, University of Chile, Santiago, Chile

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Antonio AtiasUnit of Parasitology, Department of Pre-Clinics and Medicine, West Faculty of Medicine, and Unit of Parasitology, Department of Experimental Medicine, South Faculty of Medicine, University of Chile, Santiago, Chile

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Myriam LorcaUnit of Parasitology, Department of Pre-Clinics and Medicine, West Faculty of Medicine, and Unit of Parasitology, Department of Experimental Medicine, South Faculty of Medicine, University of Chile, Santiago, Chile

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Jorge OlguínUnit of Parasitology, Department of Pre-Clinics and Medicine, West Faculty of Medicine, and Unit of Parasitology, Department of Experimental Medicine, South Faculty of Medicine, University of Chile, Santiago, Chile

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The effectiveness of five treatment regimens was compared in mice during acute and late infection with Toxoplasma gondii. Parasitic cure rates, as judged by failure of brain tissue from surviving mice to produce infection when inoculated into clean mice, were as follows: pyrimethamine + sulfamethoxypyridazine, 92%; clindamycin + sulfamethoxypyridazine, 75%; spiramycin + sulfamethoxypyridazine, 16.7%; trimethoprim + sulfamethoxazole, 16.7%; sulfamethoxypyridazine alone, 0%. Pyrimethamine + sulfamethoxypyridazine was the most effective combination against acute toxoplasmosis in mice.

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