118 Tuberculosis. 



With this method he succeeded in rendering the animals resistant 

 to artificial infection with bovine tubercle bacilli. 



Since immunization methods have not offered uniformly 

 satisfactory results, and since they must be prohibited on the 

 ground of milk hygiene, therefore results may be expected only 

 from proved sanitary police measures. 



The methods which must be followed in the eradication of 

 bovine tuberculosis are: 



1. Diminution or elimination of the sources of infection, 



(a) By removal of the animals passing bacilli, 



(b) By separation of healthy and suspected or diseased 



animals, 



(c) By bringing up tuberculosis-free young animals. 



2. Improvement of the general methods in the care of young 

 stock, by introducing conditions which approach the natural mode 

 of living: 



(a) Proper care and feeding in well ventilated and lighted 



stables, 



(b) Dividing the pastures so that the animals may be sepa- 

 rated (according to whether they are suspected or healthy) and 

 kept in accordance with their age and with the use for which they 

 are later intended. 



Measures for eradication must be applied in accordance with 

 the rules here outlined. 



The most effective method of eradication was worked out by 

 Bang, and consists in the elimination of clinically recognizable dis- 

 eased animals, the separation of reacting animals, and the bringing 

 up of calves on milk free of tubercle bacilli. 



The remarkable value of Bang's methods has been proven fully 

 in practice by the results obtained since 1892. 



It is important for the results to separate completely the 

 animals which fail to react to tuberculin, that is the healthy cattle, 

 from those which harbor the disease and which react to the tuber- 

 culin test. This should be done in such a way that the healthy 

 animals are placed in a freshly disinfected stable or in a portion 

 of a stable provided with a separate entrance, and separated with 

 a board wall, from that part in which the reacting cattle are housed. 

 The attendants of the healthy herd should not come in contact with 

 those of the diseased herd. Animals of the reacting group which 

 after a time become affected so that they may be clinically recog- 

 nized, should be slaughtered as soon as possible. 



Young stock which react should not be permitted to breed, or 

 at least should be immediately placed with the reacting group, 

 providing their breeding value is such that this procedure is 

 deemed advisable. All reacting animals under six months of age 

 should be slaughtered, that is they should be utilized for meat. 



Young stock and work oxen should also be included in the 



