494 DISEASES OE CATTLE. 



extreme thirst, and gradual extension of paralysis to other parts of 

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

 six weeks in horses, and from one to six months in 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. Quinine, 

 arsenic, methylene blue, and other drugs have been used, but without 

 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 

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

 extension to the viscera. The swellings rupture and discharge a 

 purulent yellowish fluid, which contains the causative organism. 

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

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

 ent organism, the streptothrix of Nocard. Moreover, cattle are im- 

 mune 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 

 only been described as occurring in Guadeloupe and France, the 

 possibility of its occurrence in our new possessions warrants its men- 

 tion in this chapter. 



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

 ings and syringing them out with 5 per cent creolin or carbolic acid. 

 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. 



NOTE. 



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

 which will be found in previous chapters: 



Page. 



White scour of calves 35 



Contagious abortion 161 



Inf ectios opthalmia (pink eye) - 344 



