title: Radioimmunoassay for the detection of antigen-specific IgM, IgG, and IgA in equine sera.
abstract: A radioimmunoassay was developed to discriminate immunoglobulin (Ig) classes specific for the J-5 mutant of Escherichia coli (serotype O:111-B4). Adult horses were periodically inoculated IM with a nonviable suspension of the J-5 mutant emulsified in Freund's incomplete adjuvant. Before and after the horses were inoculated, sera were collected sequentially and examined by radioimmunoassay. Rabbit anti-(horse) Ig and [125I]protein A served as the indicator system. Antigen-specific IgM, IgG, and IgA were observed to follow a classic immune response. The radioimmunoassay offers a valuable tool for the discrimination of circulating, antigen-specific Ig in the horse.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis*; D001428:Bacterial Vaccines / Q000276:immunology; D004926:Escherichia coli / Q000235:genetics / Q000276:immunology; D006736:Horses / Q000276:immunology*; D007070:Immunoglobulin A / Q000032:analysis*; D007074:Immunoglobulin G / Q000032:analysis*; D007075:Immunoglobulin M / Q000032:analysis*; D009154:Mutation; D011863:Radioimmunoassay / Q000662:veterinary*; D014611:Vaccination / Q000662:veterinary
chemical_list: D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M