18 
Farmers’ Bulletin 1060. 
the eve receiving the treatment, which may occur in from 3 to 10 
hours after tho application or even later. Some swelling and inflam¬ 
mation of the eye and lids are often noted. 
POST-MORTEM APPEARANCES. 
Animals affected with tuberculosis may show tho effects of the 
disease in almost any„part of the body. In advanced cases tho 
lesions are easily found, but when the disease is of recent origin or 
if a slightly diseased area has been encapsulated or closed up, it is 
often very difficult to find evidence of the disease. Lesions in 
advanced cases generally appear as nodules or lumps, which are 
tubercles formed as a result of the disease. These lumps may be 
found in great numbers in the lungs and abdominal organs. The 
lesions are of various sizes and may contain pus, either soft or hard; 
many times it is gritty. Tubercles are often found in various num¬ 
bers attached to the walls of the thoracic and abdominal cavities. 
Lesions of the disease also occur in the lungs, liver, and spleen. 
The lymph glands, to some extent, are usually affected, and, when 
cut into, show diseased areas characteristic of tuberculosis. 
Lesions of the disease may be found also in the skin and in or 
on tho bones. In animals only slightly diseased, the lesion may be 
hidden so that it is impossible for even the most skillful person in 
post-mortem work to find it. A microscopic examination of the 
lymphatic glands or other tissues often reveals the presence of 
tubercle bacilli when no lesions can be seen by the naked eye, a 
condition showing that the disease is just starting. When animals 
have reacted to the tuberculin test, a very careful post-mortem 
examination should be made. The action of tuberculin is often 
discredited when on post-mortem the lesions are not plainly seen, 
but experience of many years has shown that very few animals 
reacting to tho test wore not affected with tuberculosis to some 
extent even though some were very slight. 
METHODS OF ERADICATION. 
Cattle owners who do not know whether tuberculosis exists amoiw 
O 
their animals should ascertain the fact by having them tuberculin- 
tested and physically examined by a qualified veterinarian. In 
many cases thousands of dollars and very valuable breeding animals 
might have been saved by taking up tuberculosis-eradication work 
in time. Three main projects comprise the general campaign of 
eradication, as follows: 
1. Eradication of tuberculosis from pure-bred herds of cattle. 
2. Eradication of tuberculosis from circumscribed areas. 
3. Eradication of tuberculosis from swine. 
