PATHOGENIC BACTERIA. 153 



Form. Long, wavy threads (16 to 40 p long), a true spiril- 

 lum ; flagella are present. 



Properties. Very motile. Has not been cultivated. 



Staining. Ordinary aniline stains. Bismark brown best for 

 tissue sections. 



Pathogenesis. Found in the organs and blood of recurrent 

 fever. Man and monkeys inoculated with blood from one suf- 

 fering from this disease become attacked with the fever, and 

 in their blood the spirillum is again found. It is found in the 

 blood, only in the relapses (during the fever). After the attack 

 the spirilla gather in the spleen and gradually die there. It 

 has been found in the brain, spleen, liver, and kidneys. In the 

 secretions it has not been discovered. 



FIG. 87. 





Spirochaeta Obermeieii in the blood (von Jaksch). 



Bacillus of Soft Chancre. (Ducrey-Unna.) 



A diplobacillus which is specific has been described by Ducrey 

 as obtained from the secretion and in the depth and margins 

 of the chancroid. Unna's bacillus is narrower and unbroken 

 in the center. 



Cultivation. Unsuccessful. 



Staining. With borax, methylen-blue, decolorized with weak 

 acetic acid. 



Pathogenesis Probably a mixed infection occurs in most 

 chancroids, especially if buboes result. The bacillus of Ducrey 



