MORBID ANATOMY 427 



suddenly drops. After this time the temperature oscillates 

 between 35° and 41° C. Emaciation is rapid, the hair becomes 

 rough and may fall out. There is a tendency to diarrhea. 

 There is edema of the abdominal walls. In cattle the symp- 

 toms are not usually so acute as in the horse. 



The duration of the disease is said to vary from a week to 

 six months or more. The appetite remains good until near the 

 end. According to Bruce recovery is rare. 



§ 338. Morbid anatomy. There appear to be no dis- 

 tinctive anatomical changes for this affection. The tissues 

 generally are repoited to be anemic and infiltrated with a ser- 

 ous exudate. If the edematous portions are incised a clear 

 amber or citron colored fluid escapes. The spleen may be en- 

 larged but the color and consistency are normal. The liver 

 and kidneys are said to be slightly affected. 



§ 339. Differential diagnosis. The diagnosis is made 

 clinically from the progressive anemia and edema, coincident 

 with a good appetite. The finding of the parasite in the blood 

 is positive evidence. This disease is to be differentiated from 

 the other afiections caused by tr)'panosoma. 



RBFERENCES 



1. Bruce. Preliminary report on the tsetse-fly disease or nagana, 

 in Zululand. Durham, 1895. 



2. Kanthack, Durham and Blandsord. On nagana or tsetse- 

 fly disease. Proceedings of the Royal Society, Vol. I/YIV (1898) , p. 100. 



3. Laveran and ME.SNir,. Recherches morphologiques et exper- 

 imentales sur le trypanosome du nagana ou maladie de la mouche 

 tsetse. Ann. de I' Inst. Pasteur, 1902, p. i. 



4. Plimmer and Bradford. A preliminary note on the mor- 

 phology and distribution of the organism found in the tsetse-fly disease. 

 The Veterinarian, Vol. LXXII (1899), p. 648. 



5. TheilER. Die Tsetse-Krankheit. Schioeizer-Archivfiir Thier- 

 heilk., 1901. S. 97. 



§ 340. Differentiation of surra, dourine, mal de 

 caderas and nagana. The divergence of opinion concern- 



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