218 SPECIAL BACTERIOLOGY 



BACILLUS LACTIS ALBUS (LOFFLER). 



Found in butter-milk ; very long motile bacilli, arranged sometimes 

 in threads. Spore formation present. 



Biological Characters. Gelatine media are liquefied. 



On Agar a thick whitish coating develops. 



On Potatoes dry white colonies. 



Milk is coagulated, and the casein peptonised. 



BACILLUS LACTIS (BLEISCHII). 



Found in butter-milk ; large motile bacilli, forming spores. 

 Biological Characters. Facultative anaerobe. 

 Gelatine Media are liquefied. 



On Agar and Potatoes a light grey coating. The spores are very 

 resistant, and are only killed after being cooked for six hours. 



BACILLUS LACTIS ERYTHROGENES (HUEPPE). 



Found in red-coloured milk ; short, non-motile rods 0'3 to 0'5 by 1 to 



1-4 fJL. 



Spore Formation absent. 



Biological Characters. On Gelatine Plates, round, yellow, gradually 

 liquefying colonies ; the gelatine surrounding the colonies is coloured 

 red. 



In Gelatine Stab Cultures the development is very slow ; and kept in 

 a dark place, the medium is coloured red. 



On Agar and Potatoes a yellowish coating develops, while the sur- 

 rounding medium is coloured a faint red. 



Milk is fermented and peptonised, obnoxious-smelling gases being 

 formed ; it is at first a dirty red, then brownish-red, and finally blood- 

 red coloured. The yellow pigment in the colonies is soluble in all 

 extractive materials, while the red pigment is also soluble in water. 



Pathogenesis. The red milk is not pathogenic for man. 



BACILLUS LACTIS PITUITOSI (LOFFLER). 



Obtained by Loffler from milk. 



Microscopical Appearances. Somewhat thick, slightly bent rods, 

 that soon break up into coccoid-like segments. 



Biological Characters. In gelatine it forms white colonies which, 

 by transmitted light, appear brown-coloured, usually sharply outlined, 

 but sometimes indented. 



On Agar, dirty white-like colonies develop. 



