title: Detection of immunoglobulin G to Pasteurella haemolytica capsular polysaccharide by enzyme-linked immunosorbent assay.
abstract: An enzyme-linked immunosorbent assay (ELISA) was developed for the detection of immunoglobulin G (IgG) to the capsular polysaccharide (CP) of Pasteurella haemolytica serotype 1. Purified CP was first covalently coupled to poly-L-lysine and then optimally adsorbed at a concentration of 5 micrograms/ml to microtiter plates in the presence of carbonate-bicarbonate buffer (pH 9.8). The ELISA was used to evaluate and compare the CP-specific IgG response of calves vaccinated with different P. haemolytica-derived experimental vaccines. Elevated levels of ELISA IgG titers were detected in postvaccination sera and lung lavage from calves vaccinated intradermally with live logarithmic-phase organisms or the culture supernatants. The ELISA was found to be a rapid, reproducible, and sensitive technique for the detection of CP-specific antibodies and may be useful to delineate the protective role of these antibodies in bovine pneumonic pasteurellosis.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis; D001428:Bacterial Vaccines / Q000276:immunology*; D002417:Cattle / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D007074:Immunoglobulin G / Q000032:analysis*; D008168:Lung / Q000276:immunology; D010325:Pasteurella / Q000276:immunology*; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D014611:Vaccination / Q000662:veterinary
chemical_list: D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines; D007074:Immunoglobulin G; D011135:Polysaccharides, Bacterial