title: Diagnosis of swine trichinosis by enzyme-linked immunosorbent assay (ELISA) using an excretory--secretory antigen.
abstract: An excretory--secretory (ES) antigen was used in a serodiagnostic enzyme-linke immunosorbent assay (ELISA) for swine trichinosis. ELISA procedures included a double-antibody test, using either an anti-swine IgG or a protein A enzyme conjugate, and a triple-antibody test using a pig IgG heavy-chain specific second antibody with a conjugated third antibody. The ES antigen was effective in eliminating all false-positive reactivity in sera from farm-raised hogs. The triple-antibody procedure was more sensitive and demonstrated a greater efficiency in detecting positive animals and early seroconversions. Naturally-infected pigs with worm burdens as low as 0.01 larvae per gram (LPG) of diaphragm were seropositive using these procedures. Seroconversion in experimentally-infected animals receiving low doses of muscle larvae (500) occurred considerably later than in animals receiving high doses (10000). This might account for false-negative reactions in naturally-infected animals with very low (less than 0.1 LPG) worm burdens.
mesh_terms: D000818:Animals; D000941:Antigens / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D051381:Rats; D011919:Rats, Inbred Strains; D012698:Serologic Tests; D013552:Swine; D013553:Swine Diseases / Q000175:diagnosis*; D014234:Trichinella / Q000276:immunology*; D014235:Trichinellosis / Q000662:veterinary*
chemical_list: D000941:Antigens