2. What are the symptoms of hog-cholera?

3. Give the preventive and curative treatment of hog-cholera.

4. What is anti-hog-cholera serum? Give the different methods of
vaccination and treatment.




CHAPTER XXVII

TUBERCULOSIS


[Illustration: FIG. 88.--Koch's _Bacillus tuberculosis._]

Tuberculosis is a contagious an and domestic animals, affecting any the
lymphatic glands and lungs, change in the tissues is the formation tubercle
or nodule.

HISTORY.--Tuberculosis is one of the oldest of known diseases of domestic
animals and man. Its contagious character was proven by Villemin in 1865,
who by experential infection transmitted tuberculosis from man to animals
and from animal to animal. It was in 1882 that Dr. Robert Koch discovered
and proved by inoculation experiments that the disease was caused by a
specific germ (Fig. 88). Prior to the experiments by Villemin and Koch, the
belief was that tuberculosis was due to heredity, unsanitary conditions and
inbreeding. Following discovery of the specific germ and conditions
favoring its development and spread, numerous scientifically conducted