Abstract
The occurrence of an epidemic of sleeping sickness involving 2,500 persons in the Busoga and Samia districts of Uganda is described. Proof is given that the trypanosome responsible is T. rhodesiense . Epidemiological and experimental results point to G. pallidipes as the principal vector. The part played by G. palpalis is still uncertain. Experiments are described which prove that G. pallidipes can carry naturally a trypanosome of the brucei-rhodesiense group which is capable of causing sleeping sickness in man. It is probable that the infection was introduced by alien labourers from the west of Lake Victoria.

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