Wiener klinische Wochenschrift

, Volume 122, Supplement 3, pp 52–56 | Cite as

Sensitivity to artemisinin, mefloquine and quinine of Plasmodium falciparum in northwestern Thailand

  • Felix Hüttinger
  • Wichai Satimai
  • Gunther Wernsdorfer
  • Ursula Wiedermann
  • Kanungnit Congpuong
  • Walther H. Wernsdorfer
Original article

Summary

The 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 (IC50 and IC90) for artemisinin were 0.0081 and 0.1372 μM, respectively. For mefloquine the IC50 was 0.1260 μM and the IC90 was 3.7345 μM. Quinine showed an IC50 of 0.2155 μM and an IC90 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.

Keywords

Plasmodium falciparum Drug sensitivity Artemisinin Mefloquine Quinine Thailand 

Sensibilität gegenüber Artemisinin, Mefloquin und Chinin bei Plasmodium falciparum im nordwestlichen Thailand

Zusammenfassung

Die zunehmende Resistenzentwicklung bei Plasmodium falciparum ist ein weltweites Problem. Diese Studie hatte das Ziel, die in vitro Aktivität von Artemisinin, Mefloquin und Chinin bei Plasmodium falciparum in einem Gebiet mit ausgeprägter Multiresistenz, zu ermitteln. Zu diesem Zweck wurde die arzneimittelbedingte Hemmung der Schizontenreifung gemessen. Bei insgesamt 43 erfolgreich getesteten Isolaten von P. falciparum ergaben sich mittlere Hemmkonzentrationen – IC50, IC90 – für Artemisinin von 0,0081 und 0,1372 μM. Für Mefloquin ergaben sich analog die Konzentrationen 0,1260 und 3,7345 μM. Chinin zeigte eine mittlere IC50 von 0,2155 μM und eine IC90 von 2,5040 μM. Alle getesteten Medikamente zeigten einen signifikanten Wirkungsverlust im Vergleich mit Ergebnissen aus den vorangegangenen Jahren. Dies deutet auf einen weiteren Anstieg der Resistenzentwicklung bei P. falciparum hin, besonders kritisch bei Artemisinin und Chinin.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Felix Hüttinger
    • 1
  • Wichai Satimai
    • 2
  • Gunther Wernsdorfer
    • 3
  • Ursula Wiedermann
    • 1
  • Kanungnit Congpuong
    • 2
  • Walther H. Wernsdorfer
    • 1
  1. 1.Centre for Pathophysiology, Infectiology and Immunology, Institute of Specific Prophylaxis and Tropical MedicineMedical University of ViennaViennaAustria
  2. 2.Directorate of Vector-Borne Disease ControlMinistry of Public HealthNonthaburiThailand
  3. 3.Faculty of Tropical MedicineMahidol UniversityBangkokThailand

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