In vivo antimalarial drug efficacy studies of uncomplicated Plasmodium falciparum malaria at an isolated site in the Amazon basin of Peru bordering Brazil and Colombia showed >50% RII/RIII resistance to sulfadoxine-pyrimethamine but no evidence of resistance to mefloquine.
Antimalarial drug resistance; Plasmodium falciparum; Sulfadoxine-pyrimethamine; Mefloquine; Peru