DISEASES OF FARM ANIMALS 



105 



fungus, into the tissues. This causes an inflamma- 

 tion, with an increase in the amount of tissue, as 

 shown by the enlargement and in which an abscess 

 is formed. Adult cattle are the only animals com- 

 monly affected with this disease, but occasionally 

 nearly all classes of domestic animals may be af- 

 fected. A number of cases have also been reported 

 in man, but the disease in cattle, being localized to 



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LUMPY JAW 

 An exterior view showing location of lumpy jaw. 



a small region of body, usually the head, there is 

 little danger of transmission from animal to man 

 in eating beef. 



The symptoms are recognized by the character- 

 istic tumor, usually observed on the jaw, either of 

 the bone or of the soft tissues in that vicinity. It 

 may, however, affect the tongue, or, in fact, nearly 

 any of the organs of the body. Its development is 

 more or less of a slow, constant growth, beginning 

 with a very small nodule, but, when allowed to run 



