In vitro Anti-Malarial Drug Susceptibility of Temperate Plasmodium vivax from Central China

Feng Lu Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, China; Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand; Department of Parasitology, Bengbu Medical College, Bengbu, Anhui, China; Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania; Department of Entomology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand

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Qi Gao Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, China; Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand; Department of Parasitology, Bengbu Medical College, Bengbu, Anhui, China; Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania; Department of Entomology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand

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Kesinee Chotivanich Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, China; Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand; Department of Parasitology, Bengbu Medical College, Bengbu, Anhui, China; Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania; Department of Entomology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand

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Hui Xia Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, China; Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand; Department of Parasitology, Bengbu Medical College, Bengbu, Anhui, China; Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania; Department of Entomology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand

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Jun Cao Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, China; Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand; Department of Parasitology, Bengbu Medical College, Bengbu, Anhui, China; Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania; Department of Entomology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand

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Rachanee Udomsangpetch Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, China; Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand; Department of Parasitology, Bengbu Medical College, Bengbu, Anhui, China; Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania; Department of Entomology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand

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Liwang Cui Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, China; Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand; Department of Parasitology, Bengbu Medical College, Bengbu, Anhui, China; Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania; Department of Entomology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand

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Jetsumon Sattabongkot Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, China; Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, and Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand; Department of Parasitology, Bengbu Medical College, Bengbu, Anhui, China; Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania; Department of Entomology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand

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In the face of recent increase of Plasmodium vivax malaria in central China, we conducted a study to evaluate in vitro susceptibility of temperate-zone P. vivax parasites to antimalarial drugs. During 2005–2006, in vitro drug susceptibility was measured for 42 clinical P. vivax isolates by using a schizont maturation inhibition technique. Geometric means of 50% inhibitory concentrations (IC50s) and 95% confidence intervals (CIs) were 10.87 (4.50–26.26) ng/mL for chloroquine, 4.21 (1.88–9.42–8) ng/mL for mefloquine, 11.82 (6.20–22.56) ng/mL for quinine, 0.13 (0.09–0.20) ng/mL for artesunate, 18.32 (8.08–41.50) ng/mL for pyrimethamine, and 17.73 (10.29–30.57) ng/mL for piperaquine. The IC50 for chloroquine was lower than those obtained from isolates from Thailand and South Korea, suggesting that chloroquine remained effective against P. vivax malaria in central China. The results further indicated that temperate-zone P. vivax isolates from China were more susceptible to chloroquine, quinine, and mefloquine than isolates from Thailand.

Author Notes

*Address correspondence to Jetsumon Sattabongkot, Department of Entomology, Armed Forces Research Institute of Medical Sciences, 315/6 Rajvithi Road, Bangkok 10400, Thailand. E-mail: jetsumon@hotmail.com

Financial support: This study was supported by the U.S. Military Infectious Diseases Research Program and a grant from the Major State Basic Research Development Program of China (973 Program, No. 2007CB513100).

Authors' addresses: Feng Lu, Qi Gao, and Jun Cao, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu 214064, China, E-mail: gaoqi54@hotmail.com. Kesinee Chotivanich, Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand. Hui Xia, Department of Parasitology, Bengbu Medical College, Bengbu, Anhui 233030, China. Rachanee Udomsangpetch, Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand. Liwang Cui, Department of Entomology, The Pennsylvania State University, University Park, PA. Jetsumon Sattabongkot, Department of Entomology, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand, E-mail: jetsumon@hotmail.com.

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