Fig. 1.

Diagram of successful experimental cyclical transmissions of patient derived T. b. gambiense (TH Gamey Dolo 80/Lib) to and between antelopes and a goat: Primary isolation by inoculation of patient's blood to a mangabey monkey (C. torquatus) and a giant rat (C. emini) and subpassages to M. natalensis followed by metacyclic infections of black backed duikers (C. dorsalis) with G. p. palpalis fed on the monkey and rodents and another metacyclic infection to a duiker and a goat; T. b. gambiense group 1 characteristics (Paindavoine et al., 1986) are retained until 1017 days after primary isolation.

(Adapted from Mehlitz, 1986).