Table 1. Primary trypanosome isolates collected from various countries and stored at the Kenya Trypanosomiasis Research Institute cryobank.
| Species of Trypanosomes: Number and period of isolation | |||||||||||||
| Country | Isolate/Year | Tbb | Tb subgroup | Tbr | Tbg | T. congolense | T. vivax | T. evansi | T. simiae | T. theileri | T. lewesi | UC | Mixed |
| Kenya | No | 101 | 194 | 274 | - | 107 | 166 | 89 | 3 | - | - | - | 29 |
| Year | 1961–2001 | 1961–2006 | 1958–2009 | - | 1961–2008 | 1969–2009 | 1968–2003 | 1970 | - | - | 18 | 1970–2006 | |
| Uganda | No | 1 | 238 | 123 | 22 | 82 | 64 | - | - | 2 | 8 | 14 | 5 |
| Year | 1968 | 1960–1983 | 1959–2004 | 1959–2002 | 1955–1983 | 1961–1972 | - | - | 1972–1973 | 1966 | 14 | 1955–1971 | |
| Tanzania | No | - | 57 | 7 | - | 35 | - | - | - | - | - | - | 9 |
| Year | - | 1966–1974 | 1934, 1959–1974 | - | 1966–1974 | - | - | - | - | - | - | 1966–1974 | |
| Botswana | No | - | - | 2 | - | - | - | - | - | - | - | - | - |
| Year | - | - | 1960 | - | - | - | - | - | - | - | |||
| Sudan | No | - | - | - | 26 | - | - | 2 | - | - | - | - | - |
| Year | - | - | - | 1982–2003 | - | - | 1973 | - | - | - | - | - | |
| Mozambique | No | - | - | 2 | - | - | - | - | - | - | - | - | - |
| Year | - | - | 1980, 1983 | - | - | - | - | - | - | - | - | - | |
| Nigeria | No | - | - | - | - | - | 4 | - | - | - | - | - | - |
| Year | - | - | - | - | - | 1970–1973 | - | - | - | - | - | - | |
| Zambia | No | - | - | - | - | 2 | - | - | - | - | - | - | - |
| Year | - | - | - | - | 1981 | - | - | - | - | - | - | - | |
| NDA | No | 2 | 21 | 8 | - | 17 | 5 | 1 | - | - | - | 3 | 2 |
| Year | 1961 | - | - | - | 1962–1985 | 1961 | - | - | - | - | - | 2 | |
| Total | 104 | 510 | 416 | 48 | 243 | 240 | 92 | 3 | 2 | 8 | 35 | 45 | |
Key: Tbb = Trypanosoma brucei brucei; Tbr = Trypanosoma brucei rhodesiense; Tbg = Trypanosoma brucei gambiense; UN = unclassified; NDA = no data available; *: academic institutes from Germany (B. Weitz Lister and Berlin University) donated these stabilates to the KETRI cryobank. Of the unclassified, 14 are from tsetse flies, two from humans, and two from unknown hosts.