TYPHOID FEVER 32; 



Healthy animals when treated with tuberculin are not 

 affected by it. 



(iii) Milk from suspected animals, or those reacting to 

 tuberculin, should be carefully pasteurized or sterilized 

 before being used for the feeding of calves or other farm 

 stock, for the tubercle bacillus is sometimes present in 

 milk from cows whose udders are apparently free from 

 the disease ; and where tuberculosis is present in the 

 system it may develop and involve the udder at a 

 rapid rate. 



Rabinowitsch, Kempner, and Mohler showed that 

 from 20 to 50 per cent, of the cows which reacted to 

 tuberculin gave milk containing virulent bacilli capable 

 of setting up tuberculosis when inoculated into animals, 

 although the reacting cows showed no signs of udder 

 disease. 



(iv) Separated milk from creameries and dairies 

 generally should be pasteurized before being used. 



(v) Only animals which do not react with tuberculin 

 should be retained for breeding purposes. 



(vi) Good ventilation and adequate lighting of the 

 buildings in which cattle are housed tend to reduce the 

 disease ; damp, dark, badly ventilated sheds reduce the 

 vitality of the animals and render them less resistant to 

 the attacks of the tubercle bacillus. 



3. Foot and mouth disease of cattle may be con- 

 veyed, especially to infants and young children, by 

 infected milk, but occurrences of the disease among 

 human beings are comparatively rare. 



4. Typhoid fever. Many epidemics of this dangerous 

 illness have been traced to the consumption of milk 

 containing the typhoid bacillus (Bacillus typhosus). The 

 disease does not attack cattle, but the entry of the 



