AVENUES OF EXIT OF INFECTIOUS AGENTS. 159 



here always practised, we would be going a long way 

 towards balancing the harm that comes from the homi- 

 cidal practice of polluting our water-supplies with every 

 conceivable filth. Viewed from this standpoint, there- 

 fore, the stools assume in disease an importance impos- 

 sible to measure. 



To disinfect the feces in every disease would be a 

 waste of time and money, besides being unscientific; 

 hence the reason for knowing those diseases in which 

 it is called for. The germs which cause the following 

 diseases are always passed in the stools : Typhoid fever, 

 Asiatic cholera, dysentery (both amoebic and bacillary), 

 tuberculosis (when the bowel is affected, or the germs 

 are swallowed by the consumptive), bubonic plague, 

 cholera infantum, and anthrax; in small-pox, measles, 

 scarlet fever, and chicken-pox, although the etiological 

 factors are not known, there is no doubt that they are 

 expelled in the feces. 



The parasites, and the eggs of parasites, found in the 

 stools are: Eggs and segments of various tape-worms, 

 eggs of round- worms {Ascaris lumbricoides), eggs and 

 worm of pin- worm (seat worm, Oxyuris vermicularis)^ 

 eggs and worms of uncinaria (in hook-worm disease, 

 Uncinariasis), worms of Strongyloides Intestinalis 

 (Endemic diarrhoea of hot countries), eggs of trico- 

 cephalus dispar, ova in HepaHca Distomiasis, ova in 

 Hcemic Distomiasis (Btlharziosis, Egyptian haematuria), 

 larvae of common house-fly. 



