title: Counterimmunoelectrophoresis using an arc 5 antigen for the rapid diagnosis of hydatidosis and comparison with the indirect hemagglutination test.
abstract: A modified counterimmunoelectrophoresis and a conventional indirect hemagglutination test were compared for routine diagnosis of human hydatid disease in an endemic area in the Middle East. Counterimmunoelectrophoresis was performed on a cellulose acetate membrane with dilutions of a commercially available antigen which interacts with sera of patients with confirmed hydatid disease to produce the arc 5 precipitin line. The test was performed with unconcentrated human sera and the lines stained in an aqueous solution of Ponceau red. Sensitivity (95.5% vs. 93.2%) and specificity (99.2% vs. 89.9%) were higher with counterimmunoelectrophoresis than with indirect hemagglutination. Cross-reactivity with sera of patients with other parasitic infections was noted with indirect hemagglutination but not with counterimmunoelectrophoresis. There was no cross-reactivity with sera of patients with autoimmune disorders by either test.
mesh_terms: D000906:Antibodies / Q000032:analysis; D000947:Antigens, Helminth / Q000276:immunology; D001327:Autoimmune Diseases / Q000276:immunology; D003378:Counterimmunoelectrophoresis; D003429:Cross Reactions; D004443:Echinococcosis / Q000175:diagnosis* / Q000276:immunology; D004446:Echinococcus / Q000276:immunology; D006386:Hemagglutination Tests; D006801:Humans; D010272:Parasitic Diseases / Q000276:immunology
chemical_list: D000906:Antibodies; D000947:Antigens, Helminth