268 
Since the blood of infected animals remains infective for some time 
after their death, and since some flies (S/omoxys and Glossing) 
capable of transmitting the disease, will feed on dead animals, great 
care should be taken to prevent flies from reaching any part of animals 
slaughtered because of trypanosomiasis. 8 The Glossinat haunt thick 
bush or grass situated near collections of water; cattle should be 
kept in clear areas. 1 Stonioxys breeds in dung; the kraals should be 
kept scrupulously clean. 
E. Game, as well as native African cattle and other 
domestic animals, may sometimes acquire a tolerance of 
certain strains of trypanosomes. 
I he African big game is usually said to be immune to trypano¬ 
somes. I olerant would perhaps be a better word. A buffalo, zebra 
and antelopes inoculated with Nagana in Europe have died of the 
disease. 9 f his " immunity,” therefore, does not extend to every 
member of these species, and must be acquired by individuals. 
Adult, apparently healthy antelopes (and other wild animals) which 
aie infected with trypanosomes are frequently killed. Because of the 
percentage* of animals infected and the abundance of biting flies, it is 
certain that a young antelope is infected with trypanosomes for the first 
time very soon after it is born, and that it will continue to be frequently 
re-infected during the whole of its life. The parasites so frequently 
found in large adult wild animals, therefore, represent either a new, 
recent re-infection or an original infection of long standing. In either 
vase the animal has grown up normally, in spite of trypanosome 
infections; it is tolerant of the parasites. It seems probable that 
the course of trypanosomiasis in African domestic animals may some 
times be of a similar type. 
a rtnfiK Ka r n . g °. trypanosomes were seen in S per cent, of cattle, it 
no eC r 1S certai,,Iy much larger ; yet this herd is increasing. There « 
•splendid condhion 01 " dUri " g ° Ur *** at KaS ° ng °’ ^ ^ ^ ^ 
two Jl anOSO, :; iaS " * S c . ornm °n and often fatal among Gambian horses (6). B 
s in ie Gambia found to be infected with Trypanosoma dimorfhon 
Trale/Z'ihlJVSt 2 *'? Cent ' infected in South Africa. In the Congo tv 
^r*jt r e?^te u Lc h ^ h r en,ige of wi,d aB,nl 
