title: Comparison of Dot-ELISA, ELISA and IFAT for the detection of IgG antibodies to Sarcocystis muris in experimentally infected and immunized mice.
abstract: The dot enzyme-linked immunosorbent assay (Dot-ELISA) was used for the detection of IgG antibodies to Sarcocystis muris and compared with the enzyme-linked immunosorbent assay (ELISA) and the indirect fluorescent antibody test (IFAT). In experimentally infected mice, first positive reactions occurred in the Dot-ELISA between 18 and 32 days after infection (dpi), in the ELISA between 18 and 49 dpi, and in the IFAT between 11 and 25 dpi. Maximum titers were 1:40 960 in the Dot-ELISA, 1:1280 in the ELISA and 1:2560 in the IFAT. High titers persisted until the end of the examination period (182 dpi) in all 3 tests. In immunized mice, all 3 tests detected antibodies 7 days after the first injection of protein antigen. The highest titers of 1:5120 and 1:10 240 were recorded in the Dot-ELISA after 35 days; titers of 1:1280 and 1:2560 were observed in the ELISA, and titers of 1:160 and 1:320 in the IFAT after 42 days. No false-positive reactions occurred in the Dot-ELISA and in the IFAT when 177 sera from non-infected mice were examined, but 1% (2/177) of the sera reacted positively in the ELISA. Sixty-three percent (94/150) of sera from mice infected experimentally with Toxoplasma gondii showed slight positive reactions up to 1:40 in the Dot-ELISA; 9% (13/150) of the sera reacted positively up to 1:40 in the IFAT and 4% (6/150) up to 1:20 in the ELISA. The Dot-ELISA appears to be a good alternative to the ELISA and the IFAT in the serodiagnosis of sarcosporidiosis and should be further evaluated for the serodiagnosis of other parasitic diseases.
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000032:analysis*; D000953:Antigens, Protozoan / Q000276:immunology; D001667:Binding, Competitive; D004797:Enzyme-Linked Immunosorbent Assay; D005455:Fluorescent Antibody Technique; D007114:Immunization; D007074:Immunoglobulin G / Q000032:analysis*; D051379:Mice; D008807:Mice, Inbred BALB C; D011237:Predictive Value of Tests; D012522:Sarcocystis / Q000276:immunology*; D012523:Sarcocystosis / Q000175:diagnosis* / Q000276:immunology; D014122:Toxoplasma / Q000276:immunology
chemical_list: D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; D007074:Immunoglobulin G