xvm PREVENTION OF TUBERCULOSIS 341 



(6) That the subcutaneous injection of tuberculin is the only 

 method of using tuberculin for the detection of tuberculosis in 

 cattle which can be recommended at the present time. 



(7) That tuberculin has no injurious effect on healthy cattle. 



(3) Evidence from Tuberculin Test. 



That a positive reaction to tuberculin in any properly conducted 

 test, official or otherwise, in any animal in any herd, shall be con- 

 sidered evidence sufficient upon which to declare the herd to be 

 infected. 



(4) Compulsory Notification. 



That this Commission recommends the passage of legislation 

 providing for the compulsory notification by owners and by 

 veterinarians of the existence of tuberculosis in a herd, whether 

 such existence be made known by detection of clinical cases or by 

 the tuberculin test. 



(5) Location through Slaughter. 



This Commission recognises that the discovery of tuberculosis 

 in animals slaughtered for food purposes furnishes one of the best 

 possible means of locating the disease on the farm, and therefore 

 recommends the adoption of some system of marking, for purposes 

 of identification, all cattle three years old and over, shipped for 

 slaughter. 



As tuberculosis of hogs is almost invariably due to bovine 

 infection, this recommendation should also be made to apply to 

 hogs of any age shipped for slaughter. 



It is further recommended that the discovery of tuberculosis 

 in animals coming under government inspection should be used, 

 whenever identification is possible, as a means of locating infected 

 herds and premises. All such cases should be reported to the 

 proper authorities for control action. 



(6) Disposition of Tuberculous Animals. 



The Commission Plan. (1) As a general policy, in the eradication 

 of tuberculosis the separation of healthy and diseased animals and 

 the construction of a healthy herd are recommended. 



In order to accomplish this, the following recommendations are 

 made : 



1. If the herd is found to be extensively infected, as shown by 

 the tuberculin test or clinical examination, even the apparently 

 healthy animals in it should be regarded with suspicion, until they 

 have been separated from the reacting animals for at least three 

 months. 



If, after the expiration of this time, they do riot react to the 



