108 MANUAL OF HUMAN PROTOZOA 



In the reproductive organ 

 1. Trichomonas vaginalis Donne 1837 



This flagellate occurs in the vagina in which the reaction 

 of the secretion has changed from alkaline to acid. There 

 are some investigators who consider it as the causative 

 organism of vaginitis, but definite information to support 

 this view is still missing. As in the other two species of 

 human Trichomonas, encysted forms have not yet been 

 found. 



Trophozoites 



1. Livings specimens. The organism (Fig. 29, l) resembles 

 r. hominis. General body form is broadly pyriform or fusi- 





/ 2 3 4 



Fig. 29. Trichomomis vaginalis. X 1150. (original) 



1. Living trophozoite. 



2. A degenerating amoeboid trophozoite in hfe. 



3. 4. Stained trophozoites. 



form, but may be varied, as it is extremely plastic. It 

 measures 10-30m long by 10-20m broad. When the prepa- 

 ration is a few hours old, many degenerating forms appear 

 (Fig. 29, 2). In such forms active amoeboid form-change 

 together with the continued movement of flagella and 



