336 



MICROBIOLOGY 



a few wild ones. It attacks nearly if not all tissues of the 

 body producing necrosis which if not checked will eventually 

 cause death. It is of much more importance in the production 

 of morbid conditions than is generally supposed. 



BACILLUS CHAUVEAUI ARLOING, CORNEVIN AND THOMAS. 



Synonyms. Bacillus charbonis Migula; Bacillus an- 

 thracis symptomatica Kruse ; bacillus of black leg. 



Place in nature. This organism is the cause of the disease 

 known as black leg, black quarter, or symptomatic anthrax. 

 This is a disease of cattle characterized by a peculiar emphy- 

 sematous swelling of the subcutaneous tissues and muscles over 



Fig. 68. Bacillus of blackleg showing spores and flagella. (Hutyra). 



the quarter affected. The disease was formerly confused with 

 anthrax. The bacillus is distributed in the soil and it is more 

 or less common in certain localities. In the United States 

 black leg is more prevalent in the Middle West tnan in the 

 East. B. Chauveaui was discovered by Bellinger and Feser x 

 and later described by Arloing, Cornevin and Thomas. 2 



Morphology. Bacilli having rounded ends, from 0.5 to 

 1.0 /A broad and from 3 to 5 ^ long. It often appears in pairs, 

 joined end-to-end, but never growing out into long filaments, 

 as the bacilli of malignant oedema are wont to do in the bodies 



1 Bellinger and Feser. Ber. thierartzl. Woch., 1878. 



2 Arloing, Cornevin and Thomas. La charbon symptomatique du 

 boeuf. Paris, 1887. 



