CHAPTER V. 

 TUBERCULOSIS, CONSUMPTION OR WHITE PLAGUE. 



I. ANIMALS SUSCEPTIBLE TO TUBERCULOSIS. II. ANIMALS EXEMPT EX- 

 CEPT BY INOCULATION. III. PREDISPOSING CAUSE OF TUBERCULOSIS. 



IV. TUBERCULOSIS IN CATTLE. V. TUBERCULOSIS IN ADVANCED 



STAGE. VI. SIGNS OF GENERALIZATION OF THE TUBERCLE. VII. 



GENERATIVE TUBERCULOSIS. 



This is an infectious disease common to man and to a large number of 

 animals caused by the bacillus tuberculosis. This disease prevails to an 

 extent which may be said to apply almost to everything having life or 

 vital energy. It is characterized by productive inflammation giving rise 

 to small rounded bodies called tubercles. 



I. Animals Susceptible to Tuberculosis. 



Among animals susceptible to tuberculosis are reptiles, fishes, birds, 

 rats, dogs, apes, monkeys, deer, elk, antelope, gazelle, camel, dromedary, 

 giraffe, kangaroo, lion, tiger, jackal, jaguar, bear, arctic-fox, common 

 cage birds, as well as birds of the farmyard, hens, turkeys, ducks, pigeons, 

 cats, goats, sheep, swine, cattle and horses. It is one of the universal 

 plagues; but modern science has discovered practical elimination by 

 prevention where it does not exist and cure where it has not made too 

 much progress. 



II. Animals Exempt Except by Inoculation. 



The horse, the ass and the mule rarely contract tuberculosis except 

 by inoculation. By inoculation the horse readily succumbs to infection. 

 Generalization with the horse takes place more certainly than with the 

 ox. The spacious stall of the horse, his outdoor life, his hard, muscular 

 exercise, the relatively small tonsils, the exclusive nasal respiration and 

 the paucity of connective tissue lymph plexuses, and the abundance of 

 red globules combine to favor immunity from this disease. Yet the 

 horse is susceptible to it and the disease once established is liable to 

 advance more rapidly to a diffuse generalization. The lesions in the 

 lungs and abdominal cavity resemble those of cattle both in nature 

 and abundance where infection exists; tubercles polypi, ulcers are more 

 common, the visceral lymph glands are early and severely attacked; the 

 liver and spleen suffer extensively, the serosse somewhat less so; lesions 

 have been noted in the vertebrse, skin and muscles. In rare instances 

 tubercles have been seen in the heart. 



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