CHAPTER XII 



UDDER-NECROBACILLOSIS 



I HAVE very little to say concerning this rare affection 

 of the udder since I have never seen a case. Jensen reports 

 a case (Mastitis in Animals, 1899). Lucet's Case VIII 

 (Mammites Aigues, 1891) is perhaps this infection, 

 although negative results were obtained by inoculation of 

 dogs, which was probably due to too short observation. On 

 the other hand, the bacteria isolated by Steiger as necrosis 

 bacilli (Bacterial Findings in Mastitis, 1904) were cer- 

 tainly not bacillus necrophorus, since they were Gram 

 positive, but were probably pyogenes bacilli. 



The infectious organism is the necrophorus bacillus. It 

 is a somewhat fine. Gram negative, obligate anaerobic, 

 thread-like bacillus which is very difficult to cultivate. It 

 is pathogenic for mice and dogs and produces typical 

 chronic lesions following inoculation. 



The organism appears to be a typical cell parasite, like 

 the pyogenes and tubercle bacillus. 



Udder-infection 



The bacillus necrophorus produces a distinct typical 

 stroma-infection [interstitial mastitis] of chronic progres- 

 sive character as in the three previous udder-infections, and 

 the milk-infection [parenchymatous mastitis] is only a com- 

 plication of it. 



Ports of Infection. — The infection can take place 

 through the blood-stream (Jensen) and probably through 

 the teat canal and wounds. 



Types of the Local Conditions. — The case reported 

 by Jensen was an embolic udder-necrobacillosis. 



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