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00925njm 22002777a 4500 dc Garcia-Barreno, Blanca author Delgado-Romero, Teresa author Benito, Sonia author Casas Flecha, Inmaculada author Pozo Sanchez, Francisco author Melero, Jose Antonio author 2014-10 Alternative methods to the standard haemagglutination inhibition (HI) and neutralization tests to probe the antigenic properties of the influenza virus haemagglutinin (HA) were developed in this study. Vaccinia virus recombinants expressing reference HAs were used to immunize rabbits from which polyclonal antibodies were obtained. These antibodies were subtype specific but showed limited intra-subtype strain specificity in ELISA. The discriminatory capacity of these antibodies was, however, markedly increased after adsorption to cells infected with heterologous influenza viruses, revealing antigenic differences that were otherwise undistinguishable by standard HI and neutralization tests. Furthermore, the unadsorbed antibodies could be used to select escape mutants of the reference strain, which after sequencing unveiled amino acid changes responsible of the noted antigenic differences. These procedures therefore provide alternative methods for the antigenic characterization of influenza HA and might be useful in studies of HA antigenic evolution. J Gen Virol. 2014 Oct;95(Pt 10):2140-2145. 10.1099/vir.0.067413-0 1465-2099 The Journal of general virology 25000959 http://hdl.handle.net/20.500.12105/15492 Exploring the antigenic relatedness of influenza virus haemagglutinins with strain-specific polyclonal antibodies