82 PARASITOLOGY. 



Disease Produced. — Actinomycosis ; lumpy jaw ; 

 big jaw. 



Distribution. — Widely distributed throughout the 

 United States and Europe ; especially common in 

 the middle West. 



Animals Infected. — Man, horse, ox and hog. 



Parts Affected. — Superior and inferior maxilla and 

 soft structures adjacent to them, glands of the head 

 and neck ; also lung tissue ; rare in other organs. 

 In the sow it has been found involving the mammae. 

 In the ox it has been found in the liver, prescapular 

 and superficial inguinal lymph glands. 



Description of Fungus. — The fungi appear in the 

 pus as yellowish granular bodies. A microscopic 

 study of these bodies shows clusters of club-shaped 

 cells in ray formation ; the small ends are directed 

 inward, forming a rosette-like circle. 



