Fractionation of Antigen for ELISA of Bovine Fascioliasis

간질증(肝蛭症)의 효소면역학적(酵素免疫學的) 진단(診斷)을 위한 항원분획(抗原分劃)

In order to obtain the most specific and sensitive antigen from crude antigens of Fasciola hepatica for the immunodiagnosis of bovine fascioliasis by the enzyme linked immunosorbent assay (ELISA), phosphate buffered saline extract of F. hepatica was prepared. The crude extract was fractionated into 7 antigens using sephadex G-100 column chromatography. Seven fractionated antigens were applied to ELISA, precipitation test and intradermal test, respectively. Results obtained are as follows: 1. The specificity (95% confidence interval in negative sera of bovine fascioliasis; Mean+$2{\times}SD$ of absorbence) of the first (MW>150,000) and the second antigens(MW 120,000) were 93.7%, but those of others including crude antigen showed 100%. 2. The sensitivity(positive sera of bovine fascioliasis having higher values with compared to the criterion) of the first, the sixth (MW 16,000) and the seventh antigen (MW<5,000) were 91.6%, 87.5% and 0%, respectively, but those of others showed all 100%. 3. The absorbance by ELISA using the fifth antigen (MW 26,000) was 8. 43-folds higher in the positive sera than that in the negative sera. This could be used as one of the most specific antigens for the immunodiagnosis of bovine fascioliasis. 4. In Ouchterlony test, precipitin lines were not found in the sera naturally infected with F. hepatica, but some were found in the sera of rabbits immunized with the crude antigens. The numbers of precipitin lines in the sera of rabbits were different in the different fractionated antigens. They were 6 in the crude, 2 in the second and the third antigens, 1 in the fourth, the fifth and the sixth antigens and absent in the seventh antigen, respectively. 5. The wheal size for bovine infected with F. hepatica was $2.46{\pm}0.15cm$ in the intradermal test antigen(saline extract of F. hepatica) supplied by the Veterinary Research Institute, Rural Development Administration, Korea. The wheal size of the first, the second and the third antigens were larger than that. of intradermal test antigen, whereas those of the fouth, the fifth, the sixth and the seventh antigens showed smaller than that of the intradermal test antigen. The results suggest that the fifth antigen may be specific antigen for the immunodiagnosis of bovine fascioliasis.