Five weeks after re-induction treatment and nine days after discharge from hospital, remittent fever occurred in a 34-year-old woman with promyelocytic leukaemia in full remission. She also had haemolytic anaemia and thrombocytopenia, as well as a reduced creatinine clearance. Findings on physical examination were unremarkable, but Falciparum malaria was found in the blood smear. Infusion of erythrocyte or platelet concentrates, administered in treating the leukaemia, was the probable source of the infection. Ten days after starting the administration of chloroquine and sulfadoxine-pyrimethamine she was discharged from hospital, cured of the malaria.