364 BACTERIOLOGY 



5. Streptothrix Krausei 



Streptothrix Krause : Centralblatt f. Bakteriol., XXVI, 1899, 209. 



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-; 



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.,< 



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



mice, guinea pigs, and rabbits. 

 Habitat. Isolated from a case of actinomycosis in man. 



6. Streptothrix necrophorus (Loffler) Schmqrl 



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



B. diphtherice-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 bodj 

 temperature. Noted by Schmorl in an infectious disease of rabbits 

 characterized by a progressive necrosis of the subcutaneous tissue, als< 

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

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

 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 loca 

 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 o 

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

 characters like the bacillus of mouse septicaemia. Old cultures beconr 

 brownish. Grow best at 20 C., and badly at 37 C. 



Pathogenesis. By inoculations into man, Rosenbach produced erysipeloiti 

 lesions. 



Habitat. Associated with erythema exudativum multiforme. 



