Early events in the pathogenesis of African trypanosomiasis in domestic cattle. 1. Localized skin reactions (chancres) which follow the bite of Glossina morsitans morsitans infected with Trypanosoma congolense, Trypanosoma brucei and Trypanosoma vivax - Akol, G.W.O.; Murray, M. (OAU/STRC, 1983)