Research Article
Volume 9 Issue 4 - 2021
Reduced Ex Vivo Sensitivity of Post Artemether-Lumefantrine Treatment Recurrent P. falciparum Isolates to Dihydroartemisinin and Piperaquine
Karim Traoré1*, Seidina AS Diakité1, Sekou Bah2, Drissa S Konaté1 and Mahamadou Diakité1
1Malaria Research and Training Center, Mali International Center for Excellence in Research (Mali-ICER), University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
2Hospital of Point-G/University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
*Corresponding Author: Karim Traoré, Malaria Research and Training Center, Mali International Center for Excellence in Research (Mali-ICER), University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali.
Received: September 17, 2020; Published: March 31, 2021


Introduction: Since 2006, the Malian National Malaria Control Program (NMCP) adapted the Artemisinin based therapeutic combination (ATC) as the first line treatment molecule of uncomplicated malaria. Artemether + lumefantrine appears to be the most ACT used in Mali. However, recent studies reported increased recurrence of post AL treatment P. falciparum infections.

Methods: Using the SYBR® Green fluorometric method of IC50 determination, we compared the sensitivity ex vivo of post AL recurrent and non-recurrent P. falciparum isolates to common antimalarial molecules.

Results: Compared to non-recurrent, post AL treatment recurrent P. falciparum isolates harbored higher IC50’s values (geometric mean, number [Min-Max]) to dihydroartemisinin (0.87 nM, 68, [0.34 - 4 nM] vs 1.14 nM, 7, [0.34 - 6 nM]; P = 0.003) and piperaquine (15.8 nM, 74 [13 - 22.6 nM] vs 17.54 nM, 6 [4.5 - 40.2 nM]; P = 0.001). Recurrent and non-recurrent P. falciparum isolates showed similar IC50’s values with mefloquine (13.35 nM, 8 [1 - 28 nM] and 12.85 nM, 74 [4 - 36 nM]; P=0.29). The geometric mean IC50 to lumefantrine in recurrent isolates (14.52 nM, 8 [3 - 50.82 nM]) was higher than that of the non-recurrent isolates (9.9 nM, 71 [1 - 38.71 nM]) but the difference was not statistically significant (p = 0.53). The geometric mean IC50 to amodiaquine for recurrent isolates (24.75 nM, 73 [9 - 88 nM]) was higher than to non-recurrent isolates (22.92 nM, 6 [5 - 88 nM]), but the difference was not statistically significant (p = 0.09).

Conclusion: Our study revealed a lower sensitivity of Post AL treatment recurrent P. falciparum isolates to dihydroartemisinin and piperaquine and a trend to higher sensitivity of those parasite to amodiaquine.

Keywords: P. falciparum; Sensitivity; Recurrent; Antimalarial Drug; Ex vivo


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Citation: Karim Traoré., et al. “Reduced Ex Vivo Sensitivity of Post Artemether-Lumefantrine Treatment Recurrent P. falciparum Isolates to Dihydroartemisinin and Piperaquine”. EC Pharmacology and Toxicology 9.4 (2021): 01-08.

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