HEMORRHAGIC SEPTICEMIA GROUP 193 



chicken cholera of Pasteur, bacillus of swine plague, and 

 bacillus of cattle-plague or pleuropneumonia. 



Bacillus of Chicken Cholera (Perroncito, Pasteur, 

 1878). Synonyms. Micrococcus cholera gallinarum; Microbe 

 en huit; amcidus bacillus; bacillus of fowl septicemia. 



Origin. In 1879 Perroncito observed this coccus-like ba- 

 cillus in diseases of chickens, and Pasteur, in 1880, isolated 

 and reproduced the disease with the bacillus in question. 



Form. At first it was thought to be a micrococcus, but it 

 has been found to be a short rod, about twice as long as it is 



Fig. 97. Bacillus of swine-plague (from photograph by E. A. de 

 Schweinitz) . 



broad, the ends slightly rounded. The center is very slightly 

 influenced by the anilin colors, the poles easily, so that in 

 stained specimens the bacillus looks like a dumb-bell or a 

 figure-of-8 (Microbe en huit). 



Properties. Does not possess self-movement; does not 

 liquefy gelatin; no spores. 



Growth. Occurs at ordinary temperature, requiring oxygen 

 for development. It grows very slowly. 

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