Recent observations on the morphology of the amebas encountered in the human intestine, and on their life cycle, have shown conclusively that there are two species of entamebas parasitic in the intestine of man, Entamoeba histolytica and Entamoeba coli, and that in rare instances species belonging to the genus Vahlkampfia, normally free living, may lead a semiparasitic existence in the human intestine for a longer or shorter period of time. In view of these facts it has been necessary to revise our classification of amebas and in the following contribution I have adopted Calkins' classification and have recorded the latest observations on E. coli, Craigia hominis and Vahlkampfia lobospinosa. If some of the statements contained in the paper appear somewhat dogmatic I can only plead in excuse the fact that they are personal opinions based on years of careful study of the organisms in question.
CLASSIFICATION AND NOMENCLATURE
CRAIG CF. THE CLASSIFICATION OF AMEBAS: WITH OBSERVATIONS ON MORPHOLOGY AND LIFE CYCLE OF ENTAMOEBA COLI, CRAIGIA HOMINIS AND VAHLKAMPFIA LOBOSPINOSA. Arch Intern Med (Chic). 1914;XIII(5):737–769. doi:10.1001/archinte.1914.00070110066004
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