ABSTRACT
Entamoeba histolytica is a pseudopod-forming, nonflagellate protozoan parasite. Based on isoenzyme analysis, typing by monoclonal antibodies to surface antigens, and restriction length polymorphism, E. histolytica has been reclassified into two species that are morphologically identical: E. histolytica, an invasive disease-causing organism, and E. dispar, a noninvasive parasite.
