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Defence reactions of Glossina morsitans morsitans against different species of bacteria and Trypanosoma brucei brucei.

Tsetse flies, Glossina morsitans morsitans, fed on rats infected with Trypanosoma brucei brucei showed wide fluctuations in total and differential haemocyte counts. Similar fluctuations occurred in controls fed on non-infected rats and also between the two groups without showing any difference which could be attributed to the infection. Trypanosome infection of the tsetse haemocoel occurred in 16.25% of the flies, starting from the second day after feeding on the infected rats, but salivary glands and proboscis became infected only after the eleventh day. About 2% of bloodstream forms of T. b. brucei injected into tsetse haemocoels completed their developmental cycle successfully. Injection of tsetse homogenates into teneral G. m. morsitans prior to exposure to trypanosome-infected feed increased T. b. brucei infections in the flies significantly. Injection of live Escherichia coli, Enterobacter cloacae and Acinetobacter calcoaceticus into tsetse induced a remarkable increase in two pre-existing haemolymph proteins with molecular weights of about 70 and 17 kilodaltons, while live Bacillus subtilis and Micrococcus luteus induced a very weak response or sometimes none at all. T. b. brucei also failed to induce any increase in these proteins. Inoculation of G. m. morsitans with live E. coli und T. b. brucei prior to feeding on trypanosome-infected rats had no effect on the salivary gland and proboscis infection rates by T. b. brucei. Injection of live T. b. brucei into the haemocoels of tsetse caused no change in total haemocyte counts, but the trypanosomes disappeared from the haemolymph so rapidly that by 48 h post-injection, only about 1% were left.