Abstract
A thorough control of sleeping sickness in a highly endemic area indirectly protects non-endemic areas at some considerable distance because of the lessened possibility of introducing the disease through travellers coming in from regions where the disease is prevalent. The rate in n.-w. Ashanti dropped materially without local precautions following a major campaign in an endemic area 200 miles to the north in the Gold Coast center located on the main North-South route of travel. Travelers from that area no longer carried the disease.

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