Cholera Suis, Hog Cholera, etc. 27 



Swine Erysipelas. B. Coli Commune. Typhoid Fever. 



B. of S. Erysipelas B. Typhi Abdominalis 



1 to 1.5/x X 0.1 to o.2yu__ 2 to 3/i X 0.4 to 0.6/u 1 to 3/u X 0.6 to 0.8/i 



Ends rounded Ends rounded Ends rounded 



Involution forms Involution forms 



Nonmotile in liquids Nonmotile or very slight- Motile __ 



ly so 



No flagella Noflagella Flagella 



Stains readily and uni- Stains uniformly or polar Stains uniformly (points 



formly clear) 



Stains in Gram's (I) Bleaches in Gram's 



Solu 



Anaerobic (F. ^Erobic).. ^Erobic (F. Anaerobic). iErobic (F. Anaerobic). 



Active growth in com- Grows well in usual nu- Grows well in usual nu- 



mon nutrient liquids trient liquids, even if trient liquids 



at 37°C acid 



Usually no growth on Yellowish thick white Grows on potato; trans- 

 potato ; variable growth on potato parent glistening sur- 

 face 



In gelatine stab-culture In gelatine amber colo- On gelatine clear colo- 



delicate feathery nies, becoming brown; nies with radiating and 



branching growth may be bubbles of gas encircling lines 



Nonliquefying Nonliquefying Nonliquefying 



Grows in milk ; acidi- Acidifies and clots milk Acidifies milk growing 

 fies, often coagulates it in 8 to 10 days freely 



Thermal death point Thermal death point Thermal death point 



(moist) 58°C. in 10 (moist) 6o°C in 10 (moist) 56°C. in 10 



minutes minutes minutes 



Loses virulence rapidly 



when dried 



Dies in water in 18 to 20 



days 



Lives and even multi- Lives and grows in faeces 



plies in rich soils, 



manure, etc 



Loses virulence slowly in 



light and air 



Pathogenic to swine, 



pigeons, sparrows, rab- 

 bits, white and house 



mice, white rats 



Guineapigs, field mice 



and hens immune 



