Quantitation of Antibodies toToxoplasma gondiiin Swine Sera by Enzyme-Linked Immunosorbent Assay

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Abstract
An enzyme-linked immunosorbent assay (ELISA) was developed for quantitation of antibodies to Toxoplasma gondii in swine sera. Because a commercial anti-swine IgG conjugate was directed also against swine IgM, the conjugate was absorbed with the IgM fraction to eliminate the interference of naturally occurring IgM antibodies that appeared consistently in sera collected from slaughtered pigs at an abattoir. The ELISA values of 0.2 or more observed in most of the sera successfully decreased to less than 0.2 by the use of absorbed conjugate. An attempt to use a protein A conjugate has failed. Evaluation of this system by comparing it with the latex agglutination test provided a high significant correlation, indicating its usefulness for serodiagnosis of swine toxoplasmosis.