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The interior mountain plateau of South Africa has a healthful climate, and malaria, if it exist, is limited to circumscribed locations. No place along the East Coast is exempt from this disease, which prevails throughout the year, although it is much more frequent during the rainy season. Professor Koch has made the statement that in German East Africa the disease as a rule reaches its topographic limits at an altitude of 3,000 feet, and from what I have seen this rule applies to most parts of Africa. As soon as we reached this altitude we no longer saw the impress of malarial poisoning stamped on the faces of the people living on the coast, and the number of malarial patients in the hospital diminished with the increase of the altitude, being smallest in Johannesburg, which is situated nearly 6,000 feet above the level of the sea. At Victoria Falls, which
SENN N. DISEASE AND HOSPITALS OF THE INTERIOR OF SOUTH AFRICA.. JAMA. 1906;XLVII(12):960-962. doi:10.1001/jama.1906.25210120034023