Recently, Echodu et al. (2015) showed theemergence of the human infective strains from the non-infective Trypanosoma brucei brucei strains of different genetic backgrounds and highlighted the importance of cattle as possible reservoir of sleeping sickness. Moreover, Capewell et al. (2013a) revealed the existence of hybrids of Trypanosoma brucei gambiense and Trypanosoma brucei brucei with novel resistance mechanism, which are able to infect humans. These facts showed the importance of research on the trypanosomatids in other mammalian host, especially free-ranging non-human primates.