TRYPANOSOMIASIS 313d 
action of Trypanosoma gambiense than are ruminants and that monkeys are 
apparently even more susceptible than man. On the other hand, the baboon is 
apparently not susceptible to infection. Lavier ! has recently tried to lower the 
resistance of baboons in order to infect them with 7’. rhodesiense by first infecting 
them with various helminths, Treponema duttoni and tubercle bacilli. However, 
he was not able to break down their immunity by these measures so that he could 
infect them successfully with trypanosomes. There is no doubt but that in a 
number of districts where G. morsitans prevails, the wild fauna harbor to some 
extent a trypanosome thought to be 7’. brucei. In some regions it has been said 
that from twenty-four to thirty-one per cent or even fifty per cent of the wild 

No. 301. — The Congo from Kongolo to Kabalo, Borassus palms along 
the bank 
game are infected with trypanosomes, and that in many instances the parasite 
is regarded as 7’. rhodesiense (see also Buchanan, page 453 of this Report). 
In the sitatunga (Tragelaphus spekev) it has been admitted that 7’. gambiense 
has been encountered (Duke), and practically all other antelopes have been 
experimentally infected.2 The antelopes, however, frequently become immune 
to any action of the parasite and merely serve as a reservoir for the infection. 
Although a number of observers failed to find a natural reservoir host for 7. 
gambiense among antelopes, except in the case of the sitatunga, they believe that 
antelope and such game generally may act as the reservoir for 7’. rhodesiense 
(brucei). Monkeys, hyenas, and buffaloes have also been found infected with 7’. 
gambiense. How virulent the trypanosomes of wild game are for man has not 
yet been determined, and no human inoculations with them, such as Taute 
1 Lavier: Loc. cit., p. 119. 
2 Wenyon: ‘‘Protozoology” (1926), I, 538. 
