PATHOGENIC BACTERIA. 



115 



Streptococcus in Diphtheria. Streptococci have been found 

 quite constant in diphtheria, but they resemble the strepto- 

 coccus pyogenes, and have no specific action. 



FIG. 58. 



Bacillus typhi, from an agar-agar culture six hours old, showing the flagella stained 

 by Loffler's method ; X 1000.(Frankel and Pfeitfer.) 



Pseudo-diphtheritic bacillus is probably a weakened or a vir- 

 ulent form of the true bacillus. 



Bacillus of Typhoid or Enteric Fever. (Eberth-Gaffky.) 



Origin. Eberth found this bacillus in the spleen and lym- 

 phatic glands in the year 1880, and Gaff ky isolated and cultivated 

 the same four years later. 



Form. Kods with rounded ends about three times as Ions as 

 they are broad. Usually solitary in tissue-sections, but in arti- 

 ficial cultures found in long threads. Flagella on the side. 



Properties. They are very motile ; they take the aniline dyes 

 less deeply than some similar bacilli. Spores have not yet been 

 found ; they do not liquefy gelatin. 



Growth. They are facultative anaerobic ; grow best at 37 

 C., but can also develop at ordinary room temperature. All 



