− | ''T. brucei'', ''T. uniforme'', ''T. congolense'' and ''T. simiae'' are found only in the tsetse fly belt of Africa due to the restricted spread of their vector. | + | ''T. brucei'', ''T. uniforme'', ''T. congolense'' and ''T. simiae'' are found only in the tsetse fly belt of Africa due to the restricted spread of their vector. ''T. vivax'' is more widespread occurring in Sub-saharan Africa as well as South America. |