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IntroductionArtemisinin-based combination therapy (ACT) is recommended by the World Health Organization as first-line treatment of uncomplicated Plasmodium falciparum malaria. ACT treatments failures among travellers returning from Africa to non-endemic countries are considered to be caused by resistance.Case presentationWe report on a case of artemether-lumefantrine treatment failure in a Turkish traveller with uncomplicated P. falciparum malaria returning from Bamako, Mali.ConclusionsInformation on returning travellers, includes ensuring that the patients receive supervised treatment with the recommended dose of a quality controlled medicine, routine follow-up of all cases, assessment of adequate absorption of the drug, and/or testing the prevalence of molecular markers of drug resistance if validated, can be an important source of an early warning system for emerging resistance.