146 



GENERAL BIOLOGY 



The ulcers caused by this organism resemble those caused by 

 entamoeba histolytica. 



Trichomonas hominis (Fig 60). 

 Cercomonas hominis 



In intestines, causing acute or chronic diarrhea. 

 Lamblia intestinalis 



Larger than the trichomonas. Flagellated forms have been 

 found in the sputum of cases of gangrene of lung, and in those having 

 pleurisy. 



Spirochaeta recurrentis (Fig. 61). 



Causes Relapsing Fever 

 (also called Famine Fever, Seven 

 Day Fever, and Tick Fever), prob- 

 ably transmitted by mosquitoes or 

 bugs. From five to seven relapses 

 take place after all symptoms have 

 disappeared. 



The spirillum or spirochete 

 is 15 to 40 micra long, shaped like 

 a corkscrew. Quite motile and pres- 

 ent in blood during the febrile 

 paroxysms, disappearing at intervals. 



"The disease has been reproduced by injecting into a healthy 

 monkey blood sucked by a bug from the infected animal." 

 Treponema Pallidum (Fig. 62). 



1. 2. 



Fig. 61. 



1. Spirochaete recurrentis, found in Russia. 



2. Same as 1, but from a patient in Africa. 

 (From Kolle-Wassermann ) . 



Fig. 62. 



Schematic drawing of undulating membrane of Spirochaetes. a and b Spiro- 



chaeta pallida ; c, S. refrinyens ; d, a small Spirochaete of the same species ; 



e, Spirochaete found in an ulcerated carcinoma ; /, Spirochaete dentium ; g, Spi- 



rochaeta plicatilis merely showing the extremity of a rather long individual. 



(After Schaudinn). 



Cause of syphillis. 



Acquired syphillis is due to a mucous membrane coming in 

 contact with the spirochete. 



Congenital syphillis is transmitted through the mother to the 

 child. 



