AUTOPSY 135 



atypical chronic and typical chronic streptomycosis. These 

 forms, however, are not sharply separated, but present 

 transition forms. 



Atypical Chronic Streptomycosis. — The affected 

 quarters are usually moderately swollen and hard. The 

 lymph-gland is not involved. The incision is dry. The 

 cut surface is even and uniform. The color is grayish- 

 white and the consistency is tendinous and sclerotic. 



The lobuli present no milk points. They are whitish- 

 gray due to sclerosis or yellowish-gray from inflammation. 

 Fibrin plugs are expressed by pressure upon the yellowish- 

 gray lobuli. There are yellow, firm and tough croupous 

 membranes in the milk-ducts and cisterns. At the same 

 time one may observe grayish-white, somewhat firm ne- 

 crotic sequesters in the cut surface which are the size of a 

 pigeon's egg or larger, show an irregular external surface 

 and contain signs of udder-tissue. As a rule the sequester 

 is moistened with a small quantity of yellowish pus and sur- 

 rounded by a thick white connective-tissue wall. 



Typical Chronic Streptomycosis. — The affected 

 quarter is not enlarged, but frequently diminished in size, 

 yet the quarter is not collapsed and thin, and it is somewhat 

 thicker, especially at the base of the teats, but the volume 

 is diminished, however. The consistency is somewhat firm. 



The incision is juicy and the juice consists of yellow, 

 thick, cream-like milk mixed with pus. The cut surface is 

 even, whitish-gray and tendinously firm, at least in the 

 inferior parts around the base of the teats. A little above, 

 the cut surface is yellowish-gray, firm and somewhat friable, 

 due to inflammation. The altered lobuli present no milk 

 points, but thick, yellow, cream-like milk can be expressed 

 from them by applying pressure. The superior part of the 

 cut surface presents unaltered lobuli which show milk 

 points. The milk-ducts and cisterns contain yellow, thick, 

 cream-like milk. 



