title: Use of indirect and competitive ELISAs to compare isolates of equine influenza A virus.
abstract: Antigenic differences within equine-1 and equine-2 isolates of influenza were studied by haemagglutination inhibition tests, indirect ELISA and competition ELISA, using the same antisera. Better differentiation was obtained with the competition ELISA than with the other two tests. All three methods produced similar relationships within the equine-1 isolates but differed in their ability to differentiate the equine-2 isolates where the competition ELISA was superior and produced epidemiologically sensible results. In all three tests, post-infection ferret and horse sera were more useful in discriminating isolates than post-vaccination sera.
mesh_terms: D000818:Animals; D000956:Antigens, Viral / Q000032:analysis*; D004797:Enzyme-Linked Immunosorbent Assay; D006385:Hemagglutination Inhibition Tests; D009980:Influenza A virus / Q000276:immunology*; D012044:Regression Analysis
chemical_list: D000956:Antigens, Viral