MICROBIAL DISEASES OF MAN AND DOMESTIC ANIMALS 887 



TRYPANOSOMIASES OF ANIMALS 



Several diseases, of great economic importance, which affect 

 domestic animals, are caused by trypanosomes. The following are the 

 most important. Tsetse-fly disease, or nagana, of Southern Africa, is 

 caused by Trypanosoma brucei (Plimmer and Bradford) and it is trans- 

 mitted by the tsetse fly, Glossina morsitans; it affects all domestic 

 animals. 



In South America, mal de caderas, a disease of horses, is caused by 

 Trypanosoma equinum (Voges) ; it is probably transmitted by a biting 

 fly, Stomoxys. 



FIG. 188. Colonization in Trypanosoma lewisi (Kent). (From Doflein.} 



All through Asia, surra, caused by Trypanosoma evansi (Steel), is a 

 severe disease of cattle and equines; it is probably transmitted by 

 biting flies. 



Trypanosoma dimorphon (Laveran and Mesnil) and many other 

 trypanosomes, more or less closely allied to it, cause diseases of 



