30 



DISEASES DUE TO PROTOZOA 



(3) Bacillary dysenteiy, caused by Shiga's, Flexner's and allied 



bacilli. 



(4) I^ilharzial 



(5) Balantidial 



(6) Malarial 



(7) Tuberculous 



M 



>> 

 »> 



(8) Nephritic 



Schistosoma mansoni. 

 Balantidium coli. 

 The malarial parasite. 

 Tubercle bacilli of Koch in 

 the intestinal ulcers, 

 associated with acute diffuse nephritis or 

 secondary to chronic nephritis with 

 an acute process superadded. 

 (9) Diphtheric colitis, a very fatal form. 



(10) Dysentery in the course of pellagra. 



(11) ,, caused by the ingestion of decompcjsing meats or 



fish. 



(12) ,, secondary to cardiac or hepatic disease. 



(13) Clinical dysentery, often climatic, when no microscopic or 



cultural findings are successful. 



AMCEBIC DYSENTERY. 

 DEFINITION. 



An acute or chronic specific disease of the intestine caused by 

 Entamoeba tetragena, sometimes accompanied by E. coli, which is said 

 to be non-pathogenic. 



The disease is generally insidious in onset with a tendency to 

 chronicity ; relapses are common; there is liability to liver abscess. It 

 may concur with other dvsenteries. 



DISTRIBUTION. 



In Africa, Asia, America, Europe, China, India, Russia, Germany, 

 in short, throughout the tropical world and frequently in the temperate 

 zone. 



THE PARASITE. 



This is the E, tetragena, but it is not unlike the E. coli on superficial 

 observation. The following points will assist in the description and 

 differentiation. 



Jt. tetragena cysts 



E. coli cysts 



10 to 40 ;U 



Spherical, when resting 



Opaque : greyish 



Ecto- and endoplasm not easily 

 distinguished. Ectoplasm not 

 refractile, homogeneous 



