52 MASTITIS OF THE COW 



media for the bacteria. Necrotic parts are removed early 

 as a prophylaxis against gangrene. The wounds are 

 cleansed once or twice a day with a mild antiseptic. 



As the development of inflammation is delayed by 

 severe primary lesions, so wounds may be treated by in- 

 flammatory irritants, as iodine solution, or with cautery. 

 Both of these methods are of a disinfecting character. 



In fever febrifuges are indicated. 



An embolic stroma-infection may perhaps occur. It 

 is undoubtedly rare, however. 



The primary condition inducing the blood infection is 

 probably in this case a streptococcic endocarditis, at least 

 such is the case in most instances. In one case of infectious 

 endocarditis that I observed the cow showed evidences of 

 streptomycosis. Streptococcic endocarditis appears to be 

 quite rare, however. 



Following penetration of the necrotic tubuli by the 

 primary lesion, i.e., by the embolic nodule, or following 

 ulceration of the tubule, a secondary infection is induced. 



It probably appears clinically as a suddenly occurring 

 milk-infection (parenchymatous mastitis) affecting one 

 or more quarters but usually one or both hind quarters. 



Summary 



I. Infectious organism: the pathogenic streptococcus. 

 Character. 

 Occurrence. 

 Morphology. 

 Cultivation. 

 Resistance. 

 Pathogenicity. 

 II. Udder-infection. Udder-streptomycosis. 



A. Milk-infection [parenchymatous mastitis]. 

 Local conditions. 

 General conditions. 

 Termination, 



