{"id":5558,"date":"2025-04-06T14:58:23","date_gmt":"2025-04-06T12:58:23","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/les-chercheurs-developpent-un-vaccin-contre-la-grippe-aviaire-h5n1\/"},"modified":"2025-04-06T14:58:24","modified_gmt":"2025-04-06T12:58:24","slug":"les-chercheurs-developpent-un-vaccin-contre-la-grippe-aviaire-h5n1","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/les-chercheurs-developpent-un-vaccin-contre-la-grippe-aviaire-h5n1\/","title":{"rendered":"Les chercheurs d\u00e9veloppent un vaccin contre la grippe aviaire H5N1"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/researchers-develop-na.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/researchers-develop-na.jpg\" data-sub-html=\"Generation and characterization of DelNS1-H5N1 vaccines. Credit: &lt;i&gt;Nature Communications&lt;\/i&gt; (2025). DOI: 10.1038\/s41467-025-58504-z\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Le Laboratoire cl\u00e9 de l&rsquo;\u00c9tat pour les maladies infectieuses \u00e9mergentes \u00e0 l&rsquo;Universit\u00e9 de Hong Kong (HKU) et au Centre Innohk pour la virologie, la vaccinologie et la th\u00e9rapeutique (CVVT) ont \u00e9t\u00e9 les pionniers d&rsquo;une plate-forme nasale de vaccin nasale \u00e0 base de vecteur de virus de la grippe et a d\u00e9velopp\u00e9 une vaccination influence aviaire nasale aviaire nasale. L&rsquo;\u00e9tude est publi\u00e9e dans <i>Communications de la nature<\/i>.<\/p>\n<p>Au d\u00e9but de la pand\u00e9mie de Covid-19, cette plate-forme a permis le d\u00e9veloppement rapide d&rsquo;un vaccin en pulv\u00e9risation nasale en collaboration avec le Biopharm Wantai de Chine continental. Apr\u00e8s avoir termin\u00e9 les essais cliniques de phase 1 \u00e0 3, il a \u00e9t\u00e9 approuv\u00e9 en 2022 en tant que premier vaccin contre le spray nasal au monde.<\/p>\n<p>Le monde vient de sortir de la pand\u00e9mie covide-19, avec des souvenirs vivants des impacts d\u00e9vastateurs du virus SARS-COV-2 sur la sant\u00e9 humaine, les \u00e9conomies et la stabilit\u00e9 sociale ces derni\u00e8res ann\u00e9es. Bien que le SRAS-COV-2 ait progressivement \u00e9volu\u00e9 en un virus respiratoire saisonnier, de nouvelles pand\u00e9mies sont in\u00e9vitables. L&rsquo;Organisation mondiale de la sant\u00e9 (OMS) et de nombreuses nations ont d\u00e9j\u00e0 commenc\u00e9 les pr\u00e9paratifs pour lutter contre les futures pand\u00e9mies potentielles caus\u00e9es par la \u00ab\u00a0maladie X.\u00a0\u00bb<\/p>\n<p>Le virus de la grippe aviaire H5N1, d\u00e9tect\u00e9 pour la premi\u00e8re fois chez l&rsquo;homme \u00e0 Hong Kong en 1997, s&rsquo;est propag\u00e9 \u00e0 l&rsquo;\u00e9chelle mondiale, engendrant plusieurs variantes et provoquant des infections \u00e0 esp\u00e8ces interm\u00e9diaires. C&rsquo;est maintenant un candidat de premier plan pour d\u00e9clencher une pand\u00e9mie humaine. Depuis le d\u00e9but de 2024, les \u00e9pid\u00e9mies incontr\u00f4l\u00e9es dans les fermes laiti\u00e8res am\u00e9ricaines ont conduit \u00e0 des dizaines d&rsquo;infections humaines, le virus circulant chez les bovins et d&rsquo;autres animaux.<\/p>\n<p>La surveillance g\u00e9n\u00e9tique a identifi\u00e9 des mutations qui am\u00e9liorent l&rsquo;affinit\u00e9 de H5N1 pour les cellules respiratoires sup\u00e9rieures humaines, ce qui fait craindre que l&rsquo;adaptation ou la recombinaison avec la grippe saisonni\u00e8re puisse augmenter consid\u00e9rablement le risque de pand\u00e9mie. La pr\u00e9paration d&rsquo;une pand\u00e9mie H5N1 potentielle est urgente, les \u00c9tats-Unis allouant 500 millions USD aux soci\u00e9t\u00e9s pharmaceutiques pour le d\u00e9veloppement de vaccins bas\u00e9 sur l&rsquo;ARNm.<\/p>\n<p>Les le\u00e7ons de la pand\u00e9mie Covid-19 soulignent que les vaccins s\u00fbrs, efficaces et rapidement d\u00e9ployables sont la strat\u00e9gie la plus critique pour la r\u00e9ponse pand\u00e9mique. Les vaccins actuels, y compris les vaccins d&rsquo;ARNm, emp\u00eachent efficacement une maladie grave et r\u00e9duisent la mortalit\u00e9 mais ne limitent pas la transmission virale. Cette limitation provient de l&rsquo;administration intramusculaire, qui induit de puissants anticorps syst\u00e9miques mais insuffisante dans les voies respiratoires sup\u00e9rieures.<\/p>\n<p>La plupart des vaccins n\u00e9cessitent \u00e9galement plusieurs doses d&rsquo;efficacit\u00e9. Un vaccin par pulv\u00e9risation nasal offrant une protection \u00e0 dose unique pourrait jouer un r\u00f4le central dans le contr\u00f4le des \u00e9pid\u00e9mies en inductif rapidement l&rsquo;immunit\u00e9 muqueuse au site primaire de l&rsquo;entr\u00e9e virale.<\/p>\n<p>Pour lutter contre la menace H5N1 \u00e9mergente, l&rsquo;\u00e9quipe HKU et CVVT a utilis\u00e9 la plate-forme de vaccin contre les pulv\u00e9risations nasales \u00e0 base de vecteur de virus de la grippe pour d\u00e9velopper un vaccin contre la grippe aviaire H5N1 H5N1. Les \u00e9tudes animales confirment son profil de s\u00e9curit\u00e9 \u00e9lev\u00e9 et sa capacit\u00e9 \u00e0 induire une immunit\u00e9 compl\u00e8te, y compris les anticorps neutralisants, les r\u00e9ponses des cellules T et l&rsquo;immunit\u00e9 muqueuse dans les voies respiratoires sup\u00e9rieures.<\/p>\n<p>Surtout, une dose unique offre une protection robuste contre l&rsquo;infection et maintient la m\u00e9moire immunitaire. D&rsquo;autres essais cliniques pourraient positionner ce vaccin comme une r\u00e9serve critique pour les futures \u00e9pid\u00e9mies H5N1, raccourcissant consid\u00e9rablement les d\u00e9lais de d\u00e9ploiement. Son m\u00e9canisme d&rsquo;administration nasal promet \u00e9galement de freiner la transmission virale au d\u00e9but d&rsquo;une \u00e9pid\u00e9mie.<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Le Laboratoire cl\u00e9 de l&rsquo;\u00c9tat pour les maladies infectieuses \u00e9mergentes \u00e0 l&rsquo;Universit\u00e9 de Hong Kong<\/p>\n","protected":false},"author":1,"featured_media":5559,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[420,288,90,620,419,2981,49,323],"class_list":["post-5558","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-aviaire","tag-chercheurs","tag-contre","tag-developpent","tag-grippe","tag-h5n1","tag-les","tag-vaccin","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - 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