| Literature DB >> 19665606 |
Isabella Alberini1, Elena Del Tordello, Alba Fasolo, Nigel J Temperton, Grazia Galli, Chiara Gentile, Emanuele Montomoli, Anne K Hilbert, Angelika Banzhoff, Giuseppe Del Giudice, John J Donnelly, Rino Rappuoli, Barbara Capecchi.
Abstract
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 in human sera after prime-boost vaccination with plain or MF59-adjuvanted H5N1 clade 1 subunit vaccines. Titers measured by pseudoparticle neutralization (PPN) assay significantly correlated with those measured by HI, single radial haemolysis or MN, with a PPN titer of 1:357 corresponding to an MN titer of 1:80. Notably, results from the PPN assay, confirm that MF59-H5N1 vaccine induces potent and long-lasting neutralizing antibody responses not only against the vaccine strain, but also against several heterologous clade 2 strains. Overall, the PPN assay represents a valid alternative to conventional serological methods for the evaluation of H5N1 vaccine immunogenicity.Entities:
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Year: 2009 PMID： 19665606 DOI： 10.1016/j.vaccine.2009.07.079
Source DB: PubMed Journal: Vaccine ISSN： 0264-410X Impact factor: 3.641