276 WALKER. 



tamoeba histolytica Schaudiniij wliicli includes Entamosba, tetragina'N\eT- 

 eek:> and which develops cysts containing 4 nuclei, is recognized. 



8. A differential diagnosis of an infection with Entamoeba coli from 

 an infection with Entamceba histolytica can be made with the microscope. 



9. An infection with either Entamoeba coli or Entamceba 'histolytica 

 inust always come directly or indirectly from another infected person. 



10. Water or uncooked food can transmit amoebic dysentery only when 

 contaminated with fsecar matter from a case of amoebic dysentery. 



11. The infection with Entamceba histolytica may pei-aist for an in- 

 definite period after the symptoms of amoebic dysentery havfei disappeared, 

 during which time the resistant, encysted entamoebse may be passed in 

 large numbers in the stools and constitute an important source of infec- 

 tion to others. Such persons are "carriers" of amoebic dysentery, com- 

 parable to the "carriers" of typhoid fever or cholera. 



12. The prophylactic measures for the prevention of amicebic dysentery 

 are sufficiently indicated by the preceding conclusions; th6y are identical 

 with those required for the prevention of other specific infectious diseases 

 of the intestinal tract, like typhoid fever and cholera. 



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