OF THE ALIMENTARY TRACT 27 



this class of human parasites in any given period 

 of time. 



Fortunately it seems unnecessary to even enter 

 into such a consideration and it appears that the oc- 

 casional cry of an alarmist is unwarranted. There is 

 no indication of the post-war spread of intestinal 

 amoebiasis which some professed to fear. 



Particular conditions which must be considered 

 and special measures which may be instituted in the 

 prevention of the spread of these protozoa wdll be 

 taken up under the consideration of the separate 

 species. 



TRANSMISSION OF ALIMENTARY TRACT PROTOZOA 



1. By autoinfection. Transfer from one habitat to 

 another in the same individual, in trophozoite 

 stage. 



A. Trichomonas vaginalis — to the mouth (?). 



B. Trichoiyionas hominis — to the vagina (?). 



C. Trichomo7ias buccalis — to the vagina (?). 



2. By direct personal contact, in trophozoite stage. 



A. Endamoeha gingivalis. 



B. Trichomonas buccalis. 



C. Trichomonas vaginalis (?). 



3. By indirect means, in trophozoite stage. 



A. Trichomonas hominis. 

 (Contamination of food and drink by fecal 

 matter). 



B. Chilomastix mesnili ( ?) . 

 (Contamination of food and drink by fecal 

 matter). 



C Endamoeha gingivalis. 

 (Salivary contamination.) 



