It works on the same principle as the tuberculin test for tuberculosis.
It is at this stage that the tuberculin test comes to the aid of the stockman.
In such dairies the tuberculin test is used at regular intervals, and the herd inspected frequently by competent veterinarians.
Inspectors may subject any cattle showing symptoms of tuberculosis to the tuberculin test before allowing them to enter.
The larger cities have also recognized the impossibility of requiring the tuberculin test of all cattle furnishing milk.
If they run with the cattle of the farm a tuberculin test of all the cattle is none the less desirable.
Many stock owners still entertain an ignorant and unwarranted dread of the tuberculin test.
That the tuberculin test is a wonderfully accurate method of determining whether an animal is affected with tuberculosis.
I have seen nothing to lead me to believe that the tuberculin test had any injurious influence on the course of the disease.
This being the case, it should not be necessary to force the tuberculin test upon owners.