72 



HUMAN INTESTINAL PROTOZOA IN THE NEAR EAST 



in small numbers before, were very numerous indeed. After the 

 attack of diarrhoea had passed off, the blastocystis were again 

 reduced. The table shows the presence or absence of E. coli free 

 and encysted, eggs of ankylostoma, the character of the stool, 

 and whether this was the result of a saline purge or not during 

 a period of about four months. 



B.I. = Brown liquid. B.uf. = Brown unformed. 

 B.sf. = Brown seraiformed. 



B.f. = Brown formed. 



(9) Is E. coli ever Pathogenic? 



E. coli is the commonest protozoon parasite of the human 

 intestine all the world over, and it is evident that for this reason it 

 must be present in all kinds of intestinal disease. The statement 

 made by Low that it is gradually being borne in upon him that 

 E. coli is sometimes pathogenic in causing diarrhoea is of little value 

 as it is backed by no evidence and he does not tell us how long he 

 has been accustomed to control his cases, with a clear idea as to 

 the differential diagnoses between E. coli and E. histolytica. 

 Because one encounters E. coli in a diarrhceic condition one must 



