PATHOGENIC BACTERIA. 30I 



chiefly under the name of streptothrix. In man they have been found in a 

 varietyof suppurative and necrotic lesions, in particular, bronchopneumonias.* 



Bacillus typhosus (Bacillus of Eberth). — ^A bacillus with 

 rounded ends, varying in length, sometimes making very short, 

 oval forms, sometimes growing out into long threads. It is 

 very actively motile, and possesses numerous flagella which 

 arise from all parts of the surface. It does not form spores. 

 It is not stained by Gram's method, but it may be colored with 

 the ordinary aniline dyes, when the stain will frequently be 



-"■-■- /. 



^ 



X>', 



^ y -' ""y * 



* /^ > 



\'>^ 









' -^''X^ 



Fig. 90. — Bacilltjs of Typhoid Fever. (X 1000.) 



somewhat irregular. It may be stained in sections of tissues 

 from cases of typhoid fever, with the aniline dyes, such as 

 Loffler's alkaline methylene-blue. It is a facultative anaerobe. 

 It grows at ordinary temperatures, better in the incubator, but 

 grows rather more slowly than B. coli communis. Gelatin is 



* Norris and Larkin. Journal Experimental Medicine. Vol. V., p. 155. 

 Musser. Philadelphia Medical Journal. September 7, 1901. Flexner. Jour- 

 nal Experimental Medicine. Vol. III. MacCallum. Centralblatt fiir Bakteri- 

 ologie. Original. Bd. XXXI. 1902. 



