NAGANA CATTLE FAECY. 509 



the body. The disease runs a chronic course, hi sting from three to 

 six weeks in horses, and from one to six months iji cattle. Besides 

 these animals, the mule, ass, buffalo, antelope, hyena, camel, and 

 dog contract the disease naturally, and sheep, goats, cats, and small 

 laboratory animals succumb to artificial inoculation. 



Lesions. — The spleen and lymphatic glands are enlarged. There 

 are sero-fibrinous exudates in the body cavities, the liver is enlarged 

 and engorged, heart flabby, and a catarrhal condition is present in 

 the respiratory passages. Pathological changes occur in the spinal 

 cord. The finding of the trypanosoma by microscopic examination 

 of the blood will be conclusive evidence for diagnosis. 



Treatment. — Treatment has not proved satisfactory. Quinin, 

 arsenic, methylene blue, and other drugs have been used, but with- 

 out success. Endeavors thus far made to produce immunity from 

 this disease have likewise been unavailing. 



CATTLE FARCY. 



This is a chronic disease of cattle occurring in France and the 

 island of Guadeloupe, "West Indies. It is characterized by caseating 

 nodular swellings, first of the skin and afterwards of the superficial 

 Ijmiphatic vessels and glands, finally proving fatal within a year by 

 extension to the viscera. The swellings ruptui'e and discharge a 

 purulent yellowish fluid, which contains the causative organism. 

 This affection, called farcin du bceuf by the French, resembles cuta- 

 neous glanders or farcy of horses, but is caused by an entirely 

 different organism, the streptothrix of Nocard. Moreover, cattle are 

 immune from glanders, and for this reason the name, unfortunately 

 applied to this disease, should not lead to any confusion with the 

 cutaneous glanders or farcy of horses. Although the disease has been 

 described as occurring only in Guadelovipe and France, the pos- 

 sibility of its occurrence in American possessions warrants its men- 

 tion in this chapter. 



Treatment. — Treatment consists in making incisions into the swell- 

 ings and syringing them out with 2 percent compound cresol solution. 

 The cavities may then be packed with cotton, soaked in 5 per cent 

 zinc chlorid solution. The swollen lymphatics may also be bathed or 

 covered with cloths wrung out in this solution. 



OTHER INFECTIOUS DISEASES. 



The following are also infectious diseases of cattle, a discussion of 

 which will be found in previous chapters : 



Page. 



Contasioiisiil)oi-tion 165 



White scorn- of calves 259 



Infectious ophthalmia (pink eye) 343 



