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The ability of 3 laboratory strains of Entamoeba histolytica (K-9, 103 and 200) to lyse the red blood cells of the human and the ox was studied. It was found that the K-9 strain lysed ox, but not human RBC; the 103 strain lysed human, but not ox RBC; the 200 strain lysed both human and ox RBC.
This selective hemolysis of the RBC of different species by separate strains of E. histolytica appears to constitute a distinct strain variation in these amebae.
* Aided by grant # AI-03655-02 from the National Institute of Allergy and Infectious Diseases, National Institutes of Health, U. S. Public Health Service.
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