MICROBIAL DISEASES OF MAN AND DOMESTIC ANIMALS 833 



brought to North America by an imported Percheron stallion. It is 

 now endemic in some of the western states and in part of southern 

 Alberta, in Canada. It is transmitted by coitus and, perhaps, rarely 

 by the bites of fleas. 



Avery large trypanosome, Trypanosoma theileri (Bruce), occurs in 

 cattle in southern Europe and in Africa and a large trj^panosome, 

 Trypanosoma americanum, resembUng this one, has been found in cattle 

 in the United States. These trypanosomes seem to do no harm to 

 their hosts. 



Although there are shght differences, the symptoms are much the 

 same in all the trypanosomiases of animals, and they much resemble 

 those which occur in the diseases produced in men by trypanosomes. 

 Occasionally, as in nagana, an animal trypanosomiasis may run an acute 

 course, and kill the host in two or three weeks, but usually, they are 

 diseases of long duration, characterized by irregular fever, oedemas and 

 progressive loss of strength, weight, and energy. Localized areas of 

 oedema beneath the skin and about the genitals are especially seen in 

 dourine; Trypanosoma equiperdum is most easily found by examining 

 serum obtained by puncturing these oedemas. 



Sporozoa (Leuckart, 1879) 

 This class contains many very important pathogenic parasites. 



CocciDiA (Leuckart) 



Coccidia of various species are parasitic in the epithelial cells Uning 

 the intestines of mice, horses, cattle, pigs, goats, and other animals. 

 In Europe, Eimeria stieda {Coccidium cuniculi) sometimes causes an 

 enteritis of cattle; in East Africa, a coccidium causes a serious disease 

 of cattle. Other coccidia kill many young pigeons, grouse, and 

 chickens. Coccidia have been reported as infecting the intestinal 

 tract of man. 



CoccrDiosis OF Rabbits 



Eimeria sUeda — ^Lindemann, 1865 

 Syn.: Coccidium cuniculi 



The coccidium causing this disease is the best known of the coccidia 

 infecting mammals. 



