Age between 6 and 59 months Mono infection with P.falciparum malaria, with parasitaemia in the range of 1,000 to 150,000 parasites per ml Absence of danger signs or signs of severe malaria. Axillary temperature >= 37.5 ºC. Absence of signs of severe malnutrition. Absence of any obvious cause of fever other than malaria. No history of allergy to CQ. Willingness to return to the health facility for follow-up. Informed consent obtained from the caretaker of the child