Trypanosoma brucei infection in the haemocoel of tsetse flies

Abstract
1,285 tsetse flies, consisting of Glossina tachinoides, G. morsitans and G. palpalis were dissected between 6 and 80 days after they had fed on animals infected with Trypanosoma brucei. The results show 11·58% with mature salivary gland infections and 8·65% with immature infections. 40 (15·27%) of all the infected flies also had trypanosomes developing in the haemocoel. These were detected by the examination of the thoracic haemolymph and of the legs, in saline. The infections occur in the 3 species of tsetse fly tested, and some are infective to mice. The morphology and infectivity to mice of the trypanosomes found in the haemocoel are described.