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Vaccination with whole inactivated virus vaccine affects the induction of heterosubtypic immunity against influenza virus A/H5N1 and immunodominance of virus-specific CD8+ T-cell responses in mice

Identifieur interne : 003687 ( Main/Curation ); précédent : 003686; suivant : 003688

Vaccination with whole inactivated virus vaccine affects the induction of heterosubtypic immunity against influenza virus A/H5N1 and immunodominance of virus-specific CD8+ T-cell responses in mice

Auteurs : Rogier Bodewes [Pays-Bas] ; Joost H. C. M. Kreijtz [Pays-Bas] ; Marine L. B. Hillaire [Pays-Bas] ; Martina M. Geelhoed-Mieras [Pays-Bas] ; Ron A. M. Fouchier [Pays-Bas] ; Albert D. M. E. Osterhaus [Pays-Bas] ; Guus F. Rimmelzwaan [Pays-Bas]

Source :

RBID : Pascal:10-0421865

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English descriptors

Abstract

It was recently shown that the use of an experimental subunit vaccine protected mice against infection with a human A/H3N2 influenza virus, but consequently affected the induction of heterosubtypic immunity to a highly pathogenic A/H5N1 influenza virus, which was otherwise induced by the A/H3N2 infection. As whole inactivated virus (WIV) vaccines are widely used to protect against seasonal influenza and also contain inner viral proteins such as the nucleoprotein (NP), the potential of a WIV vaccine to induce protective immunity against infection was tested with a homologous A/H3N2 (A/Hong Kong/2/68) and a heterosubtypic A/H5N1 influenza virus (A/Indonesia/5/05). As expected, the vaccine afforded protection against infection with the A/ H3N2 virus only. In addition, it was demonstrated that the use of WIV vaccine for protection against A/H3N2 infection affected the induction of heterosubtypic immunity that was otherwise afforded by A/H3N2 influenza virus infection. The reduction in protective immunity correlated with changes in the immunodominance patterns of the CD8+ T-cell responses directed to the epitopes located in the acid polymerase subunit of the viral RNA polymerase (PA224-233) and the NP (NP366-374). In unvaccinated mice that experienced infection with the A/H3N2 influenza virus, the magnitude of the CD8+ T-cell response to both peptides was similar on secondary infection with A/H5N1 influenza virus. In contrast, prior vaccination with WIV affected the immunodominance pattern and skewed the response after infection with influenza virus A/ Indonesia/5/05 towards a dominant NP366-374-specific response. These findings may have implications for vaccination strategies aimed at the induction of protective immunity to seasonal and/or pandemic influenza.

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Pascal:10-0421865

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<div type="abstract" xml:lang="en">It was recently shown that the use of an experimental subunit vaccine protected mice against infection with a human A/H3N2 influenza virus, but consequently affected the induction of heterosubtypic immunity to a highly pathogenic A/H5N1 influenza virus, which was otherwise induced by the A/H3N2 infection. As whole inactivated virus (WIV) vaccines are widely used to protect against seasonal influenza and also contain inner viral proteins such as the nucleoprotein (NP), the potential of a WIV vaccine to induce protective immunity against infection was tested with a homologous A/H3N2 (A/Hong Kong/2/68) and a heterosubtypic A/H5N1 influenza virus (A/Indonesia/5/05). As expected, the vaccine afforded protection against infection with the A/ H3N2 virus only. In addition, it was demonstrated that the use of WIV vaccine for protection against A/H3N2 infection affected the induction of heterosubtypic immunity that was otherwise afforded by A/H3N2 influenza virus infection. The reduction in protective immunity correlated with changes in the immunodominance patterns of the CD8
<sup>+</sup>
T-cell responses directed to the epitopes located in the acid polymerase subunit of the viral RNA polymerase (PA
<sub>224</sub>
-
<sub>233</sub>
) and the NP (NP
<sub>366-374</sub>
). In unvaccinated mice that experienced infection with the A/H3N2 influenza virus, the magnitude of the CD8
<sup>+</sup>
T-cell response to both peptides was similar on secondary infection with A/H5N1 influenza virus. In contrast, prior vaccination with WIV affected the immunodominance pattern and skewed the response after infection with influenza virus A/ Indonesia/5/05 towards a dominant NP
<sub>366</sub>
-
<sub>374</sub>
-specific response. These findings may have implications for vaccination strategies aimed at the induction of protective immunity to seasonal and/or pandemic influenza.</div>
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