Abstract
The diffusion-in-gel enzyme-linked immunosorbent assay (DIG-ELISA) for antibodies to Fasciola hepatica was evaluated using adult fluke excretory-secretory products as antigen. The sensitivity and specificity of the test were compared with those of the indirect hemagglutination (IHA) technique. The results of the DIG-ELISA showed that the reaction zone diameters obtained with 42 sera from sheep with natural or experimental exposure to F. hepatica were significantly greater than those obtained with 85 sera from ovines infected with other parasites. Both sensitivity and specificity were 100% in the DIG-ELISA, whereas the sensitivity was 68.2% and the specificity was 100% in the IHA. The data suggest that the DIG-ELISA is a valuable serodiagnostic test for sheep fascioliasis.
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