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In vitro susceptibility of Gabonese wild isolates of Plasmodium falciparum to artemether, and comparison with chloroquine, quinine, halofantrine and amodiaquine

  • B. PRADINES (a1), M. MABIKA MAMFOUMBI (a2), D. PARZY (a1), M. OWONO MEDANG (a2), C. LEBEAU (a3), J. R. MOUROU MBINA (a2), J. C. DOURY (a1) and M. KOMBILA (a2)...

Abstract

The in vitro activity of artemether against 63 African isolates of Plasmodium falciparum from Libreville, Gabon was evaluated using an isotopic drug susceptibility semi-microtest. The 50% inhibitory concentration (IC50) values for artemether were in a narrow range from 0·8 to 34·8 nm (mean IC50 5·0 nm) and the 95% confidence interval (CI95%) was 3·6–6·3 nm. In vitro decreased susceptibility or resistance were observed with artemether (14%), to chloroquine (90%), to quinine (32%). Isolate susceptibility to amodiaquine and halofantrine was high i.e. 100% and 98%, respectively. There was a significant positive correlation between responses to artemether and amodiaquine (r2=0·45, P<0·001), artemether and chloroquine (r2=0·36, P<0·001), artemether and quinine (r2=0·31, P<0·001), and artemether and halofantrine r2=0·19, P<0·01). Positive correlation between these drugs suggests in vitro cross-resistance or at least common features in drug uptake and/or mode of action or resistance.

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Corresponding author: Unité de Parasitologie, Institut de Médecine Tropicale du Service de Santé des Armées, La Pharo, BP46, 13998 Marseille, France. Tel: +33 4 91 15 01 50. Fax: 33 4 91 59 44 77. E-mail: imtssa@gulliver.fr

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In vitro susceptibility of Gabonese wild isolates of Plasmodium falciparum to artemether, and comparison with chloroquine, quinine, halofantrine and amodiaquine

  • B. PRADINES (a1), M. MABIKA MAMFOUMBI (a2), D. PARZY (a1), M. OWONO MEDANG (a2), C. LEBEAU (a3), J. R. MOUROU MBINA (a2), J. C. DOURY (a1) and M. KOMBILA (a2)...

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