VACCINE-THERAPY 189 



chains or even threads. In the tissues it is single or 

 in pairs. 



Stains aniline dyes, Gram-negative ; it is anaerobic and 

 aerobic. 



hi broth it becomes turbid with a resultant sediment. 



On gelatine bluish transparent colonies form and do 

 not liquefy. 



On agar bluish colonies also appear. 



On potato a brownish-yellow growth takes place. 



Minimum temperature 10° C, optimum 37° C, maximum 

 40° C. 



The B. suisepticus belongs to the pasteurella group, 

 and appears in the form of short rods, is non-mobile, and 

 aerobic. It stains with the ordinary dyes, and is Gram- 

 negative. 



In peptone broth the medium becomes cloudy. 



On gelatine the colonies appear like dewdrops, at first 

 transparent, but later opaque. 



On agar they grow with a whitish colour, very tough in 

 consistency, and firmly adherent to the medium. 



Minimum temperature 15° C, optimum 27° C, maximum 

 35° C. 



Macroscopical Post-Mortem Lesions. 



When swine fever is investigated in its septicemic form, 

 haemorrhages occur on the serous and mucous surfaces, and, 

 in addition, serous effusions take place. The lymphatic 

 glands are swollen and infiltrated, and also the parenchyma 

 of such organs as the spleen, liver, and kidneys. 



In the alimentary form the intestines are most commonly 

 and acutely involved, and particularly the caecum and 

 large intestines. The mucosae of the colon shows round 

 ulcers, yellow or dark grey in colour, and particularly 

 round the ileo-caecal valve, and extension of similar ulcers 

 may take place to the adjacent small intestines. In the 

 less acute cases small nodules may take the place of ulcers. 

 These stand out from the surface, and constitute the so- 



