[Fever upon return from the tropics].

Malaria is the most important dangerous febrile disease in patients returning from the tropics. Falciparum malaria can occur up to one year after leaving the tropics, tertian and quartan malaria even after many years. Laboratory diagnosis is made by thick and thin blood smear. Tertian and quartan malaria are treated by chloroquine , falciparum malaria by quinine, mefloquine or halofantrine.