Abstract
The in vivo response of Plasmodium falciparum to chloroquine and to pyrimethamine/sulfadoxine was studied for seven days in schoolchildren from two villages 30 to 40 km north of Dar es Salaam. Standard therapeutic regimen of chloroquine (25 mg base kg-1) failed to clear parasitaemia in 17 of 62 (27%) treated subjects. In contrast, standard treatment with pyrimethamine/sulfadoxine cleared the parasitaemia in all 44 treated subjects within five days. Hence, in the studied area, the therapeutic effect of sulfadoxine/pyrimethamine was superior to that of chloroquine.
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