On the Occurrence in Man of Strains of T. gambiense non-transmissible cyclically by G. palpalis

Abstract

In the Final Report of the League of Nations International Commission on Human Trypanosomiasis, published in 1928, an account was given of experiments on the transmissibility of T. gambiense by G. palpalis. These experiments, though admittedly incomplete, suggested certain conclusions, the chief of these being that prolonged sojourn of T. gambiense in an individual, whether man or animal, in which the trypanosome produces a slowly progressive illness, tends to reduce and eventually to abolish the transmissibility of the strain by tsetse.