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In non-immunes. falciparum malaria is so protean in its clinical manifestations, and so difficult to diagnose clinically in the early stages, that in an'y obscure fever in a male of military age the practitioner should inquire whether he has recently been on service abroad. If so blood slides should be immediately examined for malaria parasites. After this, appropriate treatment can be instituted if considered advisable and arrangements made for his admission to hospital without delay. Provided the patient can swallow and is not vomiting, chloroquine by mouth is probably the best drug to give orally in falciparum malaria; the course advised in the Army consists of six tablets (0.9 g. base) given on the first day, four tablets (0.6 g. base) on the second, and two tablets (0.3 g. base) on the third to fifth day. In hyperinfections and in the treatment of pernicious types of malaria, whether cerebral, algid, or gastro-intestinal, quinine dihydrochloride (10 gr.) should be given intravenously, taking five to ten minutes for the injection; it can be repeated in six hours where necessarv. Alternatively, mepacrine sulphonate can be given intramuscularly and repeated if necessary as with quinine. Ex-Servicemen who have been abroad are given a copy of a " warning slip " about malaria, which is issued to men on troopships or before emplaning from a malarious area, advising them of the possibility of malaria fever developing on their return, and telling them to report to the nearest military hospital, civilian hospital, or their own doctor should they get ill. When consulting a doctor they are advised to mention the countries in which they have served overseas and any diseases -specially malaria-from which they have suffered. The dangers of malaria and the necessity for early medical attention have been emphasized. The Hospital for Tropical Diseases (University College Hospital), London, is always prepared to investigate and admit any ex-Serviceman who has been abroad and who is suspected of malaria or other tropical disease.-I am, etc., N. HAMILTON FAIRLEY, London, W.1 Hon. Consultant in Tropical Medicine to the Army REFERENCES 1 Lancet, 1952. 2, 45, 288. 2 British Medical Journal, 1953, 2. 339.