Tuberculosis in Live Stock. 
25 
ERADICATION FROM SWINE. 
With the gradual elimination of tuberculosis from cattle, the disease 
among swine will grow correspondingly smaller. It is not necessary 
to tuberculin test all the swine herds because, with the exception of 
valuable breeding animals, it is more economical to slaughter the 
diseased ones when fat than to undertake to exterminate the disease 
in any other way. 
In the case of suspected, valuable pure-bred swine, their freedom 
from tuberculosis can be determined definitely by the intradermal 
method, which is practicable and reliable. 
The injection is near the base of the left ear; the other ear acts as a 
check for comparison. A reaction is manifested by a swelling in the 
Fig. 17.—An accredited Red Poll herd, Virginia. 
region where the tuberculin was injected. The swelling may appear 
any time from the 24th to the 104th hour after injection and will 
remain for several days. As in the case of cattle, diseased swine 
should be removed from the farm, and the sheds, farrowing houses, 
and the lots should be thoroughly cleaned and disinfected. 
MEASURES OF PREVENTION. 
Since, after many years of study and experience, no satisfactory 
cure for tuberculosis among animals has been found, prevention of 
the disease is extremely important. State and Federal Governments 
have made vigorous efforts to stop the spread of the disease by regu- 
