title: Observations on the persistence of antibodies to E. histolytica.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000032:analysis*; D004748:Entamoeba histolytica / Q000276:immunology*; D005500:Follow-Up Studies; D006386:Hemagglutination Tests; D006388:Hemagglutinins / Q000032:analysis; D006801:Humans; D008174:Lung Diseases, Parasitic / Q000276:immunology; D010995:Pleural Diseases / Q000276:immunology; D011233:Precipitin Tests; D011234:Precipitins / Q000032:analysis
chemical_list: D000906:Antibodies; D006388:Hemagglutinins; D011234:Precipitins