• Felix Hüttinger, Wichai Satimai, Gunther Wernsdorfer, Ursula Wiedermann, Kanungnit Congpuong, and Walther H Wernsdorfer.
• Centre for Pathophysiology, Infectiology and Immunology, Institute of Specific Prophylaxis and Tropical Medicine, Medical University of Vienna, Vienna, Austria.
• Wien. Klin. Wochenschr. 2010 Oct 1; 122 Suppl 3: 52-6.

AbstractThe increasing drug resistance of Plasmodium falciparum is a worldwide problem. The objective of the study was the assessment of the in vitro activity of artemisinin, mefloquine and quinine, in an area where P. falciparum is multi-drug resistant. The sensitivity tests were based on measuring the drug-dependent inhibition of schizont maturation. For the 43 successfully tested isolates the mean effective concentrations (IC(50) and IC(90)) for artemisinin were 0.0081 and 0.1372 μM, respectively. For mefloquine the IC(50) was 0.1260 μM and the IC(90) was 3.7345 μM. Quinine showed an IC(50) of 0.2155 μM and an IC(90) of 2.5040 μM. All tested drugs showed a significant reduction in the effectiveness, compared with the results of former years. This suggests a further rise of resistance of local P. falciparum, which is alarming especially for artemisinin and quinine.

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