264 



THE farmer's veterinarian 



pork or ham be eaten only after most thorough 

 cooking. 



TUBERCULOSIS.— Tuberculosis is a disease 

 resulting from the growth of tubercle bacteria in 

 the tissues of the animal. The bacteria, or germs, 

 of tuberculosis, usually gain entrance to the organs 

 of the body by being taken in with the food. Some- 

 times they penetrate through the membranes in the 



throat and get into the 

 glands of the head. Some- 

 times they are taken into 

 the digestive tract, where 

 they pass through the 

 walls of the intestines 

 into the lymph channels 

 and are carried through 

 the large lymph vessel 

 into the blood circulation. 

 In some cases it would 

 seem that the bacteria get 

 into the lungs on particles 



air7 admitted to the stomach of dust that are inhaled, 



and intestines with food and . -^ ^ . . ^ - 



drink, or estabUshed in the After gettmg mto the 



flesh by inoculation through t.^j__ fnKArrlA Karf^n'o 



broken skm or mucous mem- uuuy, xuuerLie udLiciid, 



^^^^^' multiply in the tissues to 



which they have been carried and produce the 

 changes in them which we find on the examination 

 of an animal suffering with tuberculosis. Tuber- 

 culosis, therefore, is simply the outcome of the 

 growth of the tubercle bacteria in the organs. 



Where Tubercles Are to Be Found. — Tubercu- 

 lous areas may be found in almost any part of the 

 infected animal, but the organs that are usually af- 

 fected are the lymphatic glands, either in the throat, 

 the bronchial glands or those about the intestines 

 and on the liver ; the lungs ; the liver ; the kidneys ; 



TUBERCULOSIS GERMS 



These germs may be in^ 

 haled in the lungs with the 



