CHAPTER XXX 



INFECTIOUS DISEASES OF CATTLE 



Actinomycosis, " Lumpy Jaw." — This is an infectious dis- 

 ease that is characterized by the formation of tumors and ab- 

 scesses (Fig. 117), and the destruction of the infected tissues. 

 The disease is common in cattle and usually affects the bones 

 and soft parts of the head. In the United States, where the 



Fig. 117. — A case of "lumpy jaw " 



disease is known as '' lumpy jaw," the jawbone is commonly 

 affected. In European countries the disease frequently involves 

 the tongue, and the term " wooden tongue " is applied to it. 

 The disease may affect regions of the body other than the head. 

 Actinomycosis of the lungs sometim^es occurs. Swine and horses 

 may be affected by this disease. 

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