154 Bulletin 225. 



each germ starts a new tubercle. This is the condition known as 

 generalized tuberculosis, " miliary tuberculosis !' or " quick consump- 

 tion." Fig. .31. 



When the diseased tissues are restricted to one organ, the condition 

 is known as local tuberculosis. Fig. 32. When the organs in two of 

 the cavities, such as the lungs, in the pleural cavity, and the liver in 

 the abdominal cavity, are affected the condition is known as gener- 

 alized tuberculosis. This is very important, as the meat inspection 

 regulations of this and other countries permit the flesh of animals 

 suffering from local tuberculosis to be used for food.* 



When the disease is local, it often requires a very long time for it to 

 invade the organs sufficiently to cause the death of the animal. It 

 may happen that the germs of the disease are lodged in some organ, 

 like a lymphatic gland, that is not absolutely necessary for the life 

 of the animal, and the entire organ may be destroyed without appar- 

 ent injury to the individual. If the diseased process is arrested 

 before it has advanced too far, even when it is in a vital organ, such 

 as a lung, the liver, or the kidney, the animal will continue to appear 

 to be perfectly sound. Animals thus affected are thought to be per- 

 fectly well, as they appear to be, but sooner "or later the disease starts 



*Following are the United States regulations concerning the use of flesh of 

 tuberculous animals : 



"Generalized" tuberculosis refers to that form of the disease in which the 

 bacilli have been disseminated through the blood and lymph, and in which a 

 number of organs are affected. "Extensive" tuberculosis refers entirely to the 

 amount of tuberculous matter and the number of tubercles, and may apply to a 

 case w'hich is confined to one of the body cavities. 



(1) The carcass may be passed when the lesions are limited to one group of 

 lymphatic glands or one other organ. 



(2) The carcass may be passed when the lesions are limited to two groups of 

 visceral lymphatic glands in either the thoracic or the abdominal cavity. 



(3) The carcass may be passed when the lesions are limited to two visceral 

 organs (other than lymphatic glands) in the thoracic or the abdominal cavity, 

 provided the lesions are slight, calcified, and encapsulated. 



(4) The carcass may be passed when the lesions are limited to one group of 

 visceral hanphatic glands and one other organ in the thoracic or abdominal cavity, 

 provided the lesions in the affected organs are slight. 



(5) The carcass may be passed when the lesions are confined to two groups of 

 visceral lymphatic glands and one other organ in the thoracic or the abdominal 

 cavity, provided the lesions are slight, calcified, and encapsulated. 



(6) The carcass may be passed when the lesions are confined to the lungs, the 

 cervical lymphatic glands, and one group of the visceral lymphatic glands of the 

 thoracic cavity, provided the affection is slight and the lesions are calcified and 

 encapsulated. 



(7) The carcass shall be condemned when well-marked lesions are discovered 

 in both the thoracic and the abdominal cavitv. 



