IN VITRO EFFICACY OF ANTIMALARIAL DRUGS AGAINST PLASMODIUM VIVAX ON THE WESTERN BORDER OF THAILAND

KESINEE CHOTIVANICH Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok. Thailand; Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, United Kingdom; Mae Sot Hospital, Tak, Thailand

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RACHANEE UDOMSANGPETCH Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok. Thailand; Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, United Kingdom; Mae Sot Hospital, Tak, Thailand

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WIRONGRONG CHIERAKUL Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok. Thailand; Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, United Kingdom; Mae Sot Hospital, Tak, Thailand

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PAUL N. NEWTON Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok. Thailand; Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, United Kingdom; Mae Sot Hospital, Tak, Thailand

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RONATRAI RUANGVEERAYUTH Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok. Thailand; Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, United Kingdom; Mae Sot Hospital, Tak, Thailand

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SASITHON PUKRITTAYAKAMEE Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok. Thailand; Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, United Kingdom; Mae Sot Hospital, Tak, Thailand

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SORNCHAI LOOAREESUWAN Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok. Thailand; Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, United Kingdom; Mae Sot Hospital, Tak, Thailand

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NICHOLAS J. WHITE Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok. Thailand; Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, United Kingdom; Mae Sot Hospital, Tak, Thailand

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The susceptibility of 20 isolates of Plasmodium vivax on the Thailand-Myanmar border to seven antimalarial drugs was evaluated using the schizont maturation inhibition technique. The geometric mean 50% inhibition concentration (IC50) values were quinine = 308 ng/mL, amodiaquine =14 ng/mL, chloroquine =50 ng/mL, mefloquine = 127 ng/mL, sulfadoxine/pyrimethamine (80:1) = 800/10 ng/mL, pyrimethamine = 8 ng/mL, and artesunate = 0.5 ng/mL. Compared with P. falciparum in this area, P. vivax was more sensitive to chloroquine and artesunate, equally sensitive to quinine, and more resistant to mefloquine.

Author Notes

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