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Factor H binding protein (fHbp), one of the main antigens of new vaccines against serogroup B meningococcus, varies in amino acid sequence and level of expression in different clinical isolates. To evaluate the contribution of amino acid sequence variability to vaccine coverage, we constructed a strain that is susceptible to bactericidal killing only by anti-fHbp antibodies and engineered it to express...
The standard serological methods present limitations for the measurement of immunity against H5N1 influenza strains. The hemagglutination inhibition (HI) assay lacks sensitivity and requires standardization, while the viral micro-neutralization (MN) assay needs handling of live virus. We produced pseudoparticles expressing hemagglutinin from clades 1 or 2 H5N1 in order to measure neutralizing antibodies...
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