The importance of paracolon organisms with Salmonella and Shigella antigens

  • Oscar Felsenfeld
  • Viola Mae Young


Of 1,200 paracolon organisms isolated from different sources, only 33 strains originating from ten cases manifested Salmonella “O” or Shigella antigens. One such strain having antigens VI, VII appeared in a chronic carrier of S. montevideo after the person ceased to be a carrier of Salmonella. Antigens VI, VII occurred in another strain isolated from an infant with diarrhea. Two strains, with antigens I, XII and IV, XIV, respectively, were isolated from acute diarrheas suspected of being caused by food poisoning. A strain with antigens I, VI and another with antigens IV, XIII were found in patients together with Endamoeba histolytica. Antigens I, VI and I, XIII, respectively, were present in two strains found in food poisoning outbreaks, the latter being associated with the appearance of Proteus morgani. In two cases of diarrhea in the same locality identical paracolon strains containing Salmonella antigens VI, VII, XII and Shigella antigens 3, 4, 7, simultaneously, were isolated.

The occurrence of transitory forms between Salmonella and colon-aerogenes bacilli in stools from which Salmonella have disappeared, is discussed. It is sustained, however, that paracolon organisms have to be recognized as potential pathogens.


Hydrogen Sulfide Dysentery Salicin Acute Diarrhea Colon Organism 


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Copyright information

© Springer 1945

Authors and Affiliations

  • Oscar Felsenfeld
    • 1
  • Viola Mae Young
    • 1
  1. 1.the Department of Pathology and Bacteriology of the Chicago Medical SchoolChicago

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