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Antisera prepared in mice by injection of antigens from Dirofilaria immitis, Toxocara canis, Dipylidium canium and Fasciola hepatica and sera from Dirofilaria-infected and non-infected dogs were tested at different dilutions using an enzyme-linked immunosorbent assay (ELISA). For this ELISA, adult D. immitis antigen was fractionated by gel filtration methods and then absorbed with immunoadsorbent-fixed IgG fractions from mouse sera immunized with various parasites. The results indicated satisfactory discrimination between antisera to D. immitis and those to other parasites. A significant ELISA O.D. value was considered to be greater than or equal to 0.30 with a 1 : 250 dilution of the dog sera. However, the lack of significant differences between the O.D. value of microfilaraemic and amicrofilaraemic infections was observed. These facts suggest that the use of immunoadsorbent chromatography for canine dirofilariasis is especially useful for purifying antigens and eliminating cross-reactions against other parasitic infections, when immunological methods are used for serodiagnosis.
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