Summary117 cases of malaria, all of them imported, have been diagnosed in the clinic Leopold II during 1976–78 three years period. The repartition of the Plasmodium species, the geographical origin of the patients, the circumstances favouring the disease (loss of premunition, nonexistant or poorly planned chemoprophylaxy), some particular clinical aspects, the most frequent errors of diagnosis and the methods of treatment are successively reviewed.