HEMORRHAGIC SEPTICEMIA GROUP 1 93 



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 hull; avicidus 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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