28 PROTOZOAN PARASITISM 



D. Tricho7no7ias vaginalis. 

 (Douche contamination ?). 



E. Trichomonas buccalis. 

 (Salivary contamination.) 



4. By indirect means, in encysted stage. Direct 

 fecal contamination of food and drink and eating 

 utensils or by means of flies. 



A. Endamoeha histolytica. 



B. Endamoeha coli. 



C. Endolimax nana. 



D. lodamoeba biltschlii. 



E. Chilomastix mesfiili. 



F. Giardia intestinalis. 



G. Eiyibadomonas intestinalis. 



H. Tricercomonas intestinalis. ♦ 



I. Enteromonas hominis. 



J. Balantidium coli. 



K. Isospora belli. 



L. Eimeria gubleri ( ?) . 



5. Indirectly from man through the medium of an- 

 other animal host, in encysted stage (?). 



A. Endamoeha histolytica. (Monkey. Rat. 

 Domestic pig.) 



B. Balantidium coli. (Domestic pig.) 



6. From other animals, themselves natural hosts of 

 the parasite, in encysted stage. Direct fecal con- 

 tamination of food and drink or of hands, or by 

 mean of flies. 



A. Balantidium coli. (Domestic pig.) 



B. Endamoeba histolytica. (Rat?). 



7. From other animals, themselves natural hosts of 

 the parasite, in trophozoite stage. Salivary con- 

 tamination of hands or objects or substances taken 

 into the mouth. 



A. Endamoeba gingivalis (?). (Dog. Monkey.) 



B. Trichomonas buccalis (?). (Dog.) 



