Trypanosome infection rate in cattle at Nguruman, Kenya

Trypanosome infection rate in cattle at Nguruman was investigated in a stud y conducted in 1984-1986. Shifting pastoralism significantly reduced trypan osome infections in cattle. The cattle were more heavily infected with Tryp anosoma congolense (16.5%) than Trypanosoma vivax (4.95%) and Trypanosoma b rucei (0.19%). Trypanosoma theileri was observed only once among the cattle examined. Mixed trypanosome infections in cattle were observed to be 2.75% and 0.014% for T. congolense/T. vivax and T. congolense/T. brucei, respect ively. The duration of infection in the cattle was 55 days for T. congolens e and 79 days for T. vivax. High infections in cattle were observed 2 month s after the rains, which were concomitant with high tsetse densities. (C) 1 999 Elsevier Science B.V. All rights reserved.