364 BACTERIOLOGY 



5. Streptothrix Krausei 



Streptothrix Krausej Ccntralblatt f. Baktcriol., XXVI, 1899. 309. 



Morphology. Short and long rods and clavate forms like diphtheria. Stain 



by Gram's method. Grow best at 37 ; no growth at 22 C. 

 Glycerin agar colonies. In 4 days, small, in 8 days, slightly yellowish, 2-3 



mm. ; borders erose or rosette-like ; adherent to the medium. 

 Bouillon. Clear, but a sediment of colony clumps. 

 No growth on gelatin or potato. No gas produced. No indol, and no H 2 S 



produced. Grows better aerobicly than anaerobicly. Non-pathogenic to 



mice, guinea pigs, and rabbits. 

 Habitat. Isolated from a case of actinomycosis in man. 



6. Streptothrix necrophorus (Loffler) Schmorl 



B. necrophorus LSffler: Mitteilungen a. d. Kaiserlich. Gesundheitsamte, II, 1884, 493. 



B. diphtheria-vituorum Loffler : I.e. 



Streptothrix cuniculi Schmorl: Zeitsch. f. Tiermed., XVII, 1891. 



Anaerobic. Grows best on blood serum and on blood-serum agar at the body 

 temperature. Noted by Schmorl in an infectious disease of rabbits, 

 characterized by a progressive necrosis of the subcutaneous tissue, also 

 by a fibrinous inflammation of the serous membranes, etc. By Bang and 

 Loffler, in diphtheria of calves, etc. The organisms are found at the 

 periphery of the necrotic areas, where it forms thick tufts and filaments, 

 in which true branching is not certainly demonstrated. The filaments 

 now and then break up into rods. 



Pathogenesis. Subcutaneous inoculation of mice and rabbits causes a local 

 necrosis, with multiple necrotic foci in the inner organs. 



7. Streptothrix Rosenbachii Kruse 



Fliigge, Die Mikroorganismen, 1896, 61. 



Discovered by Rosenbach: Archiv f. Chirurgie (Langenbeck), 1887. 



Morphology. Very fine branched filaments, breaking up into short rods or 

 coccoid forms. The filaments often end in a thick point. In cultural 

 characters like the bacillus of mouse septicaemia. Old cultures become 

 brownish. Grow best at 20 C, and badly at yj C. 



Pathogenesis. By inoculations into man, Rosenbach produced erysipeloid 

 lesions. 



Habitat. Associated with erythema exudativum multiforme. 



