{"id":3501,"date":"2025-01-14T17:57:47","date_gmt":"2025-01-14T16:57:47","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/la-vaccination-contre-lhepatite-e-savere-efficace-en-deux-doses-au-lieu-de-trois\/"},"modified":"2025-01-14T17:58:02","modified_gmt":"2025-01-14T16:58:02","slug":"la-vaccination-contre-lhepatite-e-savere-efficace-en-deux-doses-au-lieu-de-trois","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/la-vaccination-contre-lhepatite-e-savere-efficace-en-deux-doses-au-lieu-de-trois\/","title":{"rendered":"La vaccination contre l\u2019h\u00e9patite E s\u2019av\u00e8re efficace en deux doses au lieu de trois"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/hepatitis-e-vaccinatio.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/hepatitis-e-vaccinatio.jpg\" data-sub-html=\"Epidemic curves for suspected cases eligible for study enrollment (A) and all suspected cases regardless of eligibility (B), colored by hepatitis E case status. Credit: &lt;i&gt;The Lancet Infectious Diseases&lt;\/i&gt; (2025). DOI: 10.1016\/S1473-3099(24)00657-1\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>L&rsquo;h\u00e9patite E, une maladie virale du foie potentiellement grave, se transmet par l&rsquo;eau contamin\u00e9e. Le risque est particuli\u00e8rement \u00e9lev\u00e9 dans les populations ayant un acc\u00e8s limit\u00e9 \u00e0 l\u2019eau potable et \u00e0 l\u2019assainissement. Au Soudan du Sud, des \u00e9pid\u00e9mies ont r\u00e9guli\u00e8rement ravag\u00e9 les camps de personnes d\u00e9plac\u00e9es et leurs populations h\u00f4tes.<\/p>\n<p>M\u00eame si un vaccin est disponible depuis 2011, son sch\u00e9ma en 3 doses rend son administration difficile dans un tel contexte. Une \u00e9quipe de M\u00e9decins Sans Fronti\u00e8res (MSF), MSF Epicentre, l&rsquo;Universit\u00e9 Johns Hopkins (JHU), le minist\u00e8re de la Sant\u00e9 du Soudan du Sud, l&rsquo;Organisation mondiale de la sant\u00e9 (OMS), l&rsquo;Universit\u00e9 de Gen\u00e8ve (UNIGE) et les H\u00f4pitaux universitaires de Gen\u00e8ve (HUG) a men\u00e9 des \u00e9tudes cliniques et en laboratoire apr\u00e8s une campagne de vaccination pour \u00e9valuer son efficacit\u00e9 \u00e0 prot\u00e9ger les individus et \u00e0 contribuer \u00e0 contr\u00f4ler l\u2019\u00e9pid\u00e9mie.<\/p>\n<p>Leurs r\u00e9sultats ont montr\u00e9 que le vaccin \u00e9tait efficace avec seulement les deux premi\u00e8res doses. Ces r\u00e9sultats sont publi\u00e9s dans <i>Les maladies infectieuses du Lancet<\/i>.<\/p>\n<p>L&rsquo;h\u00e9patite E est une infection virale particuli\u00e8rement dangereuse pour les femmes enceintes et les personnes atteintes de maladies chroniques, avec un taux de mortalit\u00e9 allant jusqu&rsquo;\u00e0 10 \u00e0 50 %. \u00ab\u00a0Les sympt\u00f4mes de l&rsquo;h\u00e9patite E sont similaires \u00e0 ceux d&rsquo;autres maladies provoquant un ict\u00e8re aigu, ce qui la rend difficile \u00e0 d\u00e9tecter. M\u00eame si nous ne disposons pas d&rsquo;estimations pr\u00e9cises du fardeau mondial, certains l&rsquo;\u00e9valuent \u00e0 environ 50 000 d\u00e9c\u00e8s par an\u00a0\u00bb, explique Andrew Azman, \u00e9pid\u00e9miologiste au Centre des maladies virales \u00e9mergentes UNIGE-HUG, MSF et JHU, qui a dirig\u00e9 cette recherche.<\/p>\n<p>\u00ab Le camp de Bentiu au Soudan du Sud, qui abrite plus de 100\u00a0000 personnes d\u00e9plac\u00e9es en raison de la guerre civile, est une victime r\u00e9guli\u00e8re de l&rsquo;h\u00e9patite E et d&rsquo;autres \u00e9pid\u00e9mies de maladies d&rsquo;origine hydrique, probablement en raison des mauvaises conditions sanitaires et des inondations fr\u00e9quentes. \u00bb<\/p>\n<p>Le vaccin Hecolin, d\u00e9velopp\u00e9 en Chine et autoris\u00e9 dans certains pays depuis 2011, a \u00e9t\u00e9 recommand\u00e9 comme outil potentiel en cas d&rsquo;\u00e9pid\u00e9mie par l&rsquo;OMS. Cependant, jusqu\u2019\u00e0 cette utilisation lors d\u2019une \u00e9pid\u00e9mie, il n\u2019avait \u00e9t\u00e9 utilis\u00e9 que dans le cadre d\u2019essais cliniques contr\u00f4l\u00e9s et de m\u00e9decine des voyages en Chine.<\/p>\n<p>\u00ab\u00a0C&rsquo;est pourquoi il \u00e9tait essentiel d&rsquo;\u00e9tudier l&rsquo;efficacit\u00e9 du vaccin sur d&rsquo;autres populations et dans des r\u00e9gions o\u00f9 le type de virus circulant est diff\u00e9rent de la Chine, ainsi que la faisabilit\u00e9 logistique d&rsquo;une telle campagne\u00a0\u00bb, ajoute Isabella Eckerle, professeure \u00e0 la Facult\u00e9 de m\u00e9decine. et directeur du Centre UNIGE-HUG des maladies virales \u00e9mergentes.<\/p>\n<p>\u00ab\u00a0En particulier, il \u00e9tait important de comprendre son efficacit\u00e9 apr\u00e8s seulement deux doses, alors qu&rsquo;il est habituellement administr\u00e9 en trois doses \u00e0 six mois d&rsquo;intervalle.\u00a0\u00bb<\/p>\n<h2>Un partenariat de recherche original<\/h2>\n<p>Le Centre des maladies virales \u00e9mergentes, centre sp\u00e9cialis\u00e9 g\u00e9r\u00e9 conjointement par les HUG et la Facult\u00e9 de m\u00e9decine de l&rsquo;UNIGE, a apport\u00e9 un soutien scientifique aux \u00e9quipes de terrain de MSF en charge de l&rsquo;aspect clinique de l&rsquo;\u00e9tude.<\/p>\n<p>\u00ab\u00a0La campagne de vaccination a cibl\u00e9 les individus \u00e2g\u00e9s de 16 ans et s&rsquo;est d\u00e9roul\u00e9e en trois tours, en mars, avril et octobre 2022\u00a0\u00bb, explique Iza Ciglenecki, coordinatrice de la recherche op\u00e9rationnelle \u00e0 MSF Suisse. \u00ab\u00a0Notre \u00e9tude a ensuite compar\u00e9 le statut vaccinal de 201 patients test\u00e9s positifs \u00e0 l&rsquo;h\u00e9patite E entre mai et d\u00e9cembre 2022 avec celui d&rsquo;autres personnes de leur quartier ne pr\u00e9sentant aucun sympt\u00f4me.<\/p>\n<p>\u00ab\u00a0Malgr\u00e9 moins de cas d&rsquo;h\u00e9patite E que pr\u00e9vu apr\u00e8s la vaccination, notre \u00e9tude a r\u00e9v\u00e9l\u00e9 que deux doses de vaccin ont \u00e9t\u00e9 efficaces, un excellent r\u00e9sultat compte tenu du contexte particulier d&rsquo;un camp de personnes d\u00e9plac\u00e9es.\u00a0\u00bb<\/p>\n<p>Les \u00e9chantillons ont ensuite \u00e9t\u00e9 envoy\u00e9s aux laboratoires du Centre des maladies virales \u00e9mergentes pour d\u00e9terminer les caract\u00e9ristiques biologiques du virus et les r\u00e9ponses immunitaires. \u00ab Ces donn\u00e9es de laboratoire, difficiles \u00e0 r\u00e9aliser sur place, ont non seulement d\u00e9montr\u00e9 la protection induite par le vaccin, mais nous ont \u00e9galement permis de mieux comprendre la transmission et la performance des tests de diagnostic, ce qui peut nous aider \u00e0 concevoir de meilleures r\u00e9ponses aux \u00e9pid\u00e9mies \u00e0 l&rsquo;avenir. \u00ab\u00a0, souligne Eckerle.<\/p>\n<p>\u00ab\u00a0Ce projet repr\u00e9sente une synergie enrichissante entre l&rsquo;expertise op\u00e9rationnelle de MSF et la n\u00f4tre en mati\u00e8re de recherche translationnelle et d&rsquo;excellence diagnostique.\u00a0\u00bb<\/p>\n<h2>Un stock mondial cr\u00e9\u00e9 par l\u2019OMS<\/h2>\n<p>L&rsquo;\u00e9tude confirme donc la protection apport\u00e9e par deux doses de ce vaccin, m\u00eame en p\u00e9riode d&rsquo;\u00e9pid\u00e9mie, et la r\u00e9duction de l&rsquo;incidence de la maladie. \u00ab\u00a0Nos r\u00e9sultats, combin\u00e9s \u00e0 d&rsquo;autres, ont contribu\u00e9 \u00e0 l&rsquo;approbation r\u00e9cente par le Groupe international de coordination (ICG) de l&rsquo;OMS sur la fourniture de vaccins d&rsquo;un stock de vaccins contre l&rsquo;h\u00e9patite E pour les situations d&rsquo;urgence.<\/p>\n<p>\u00ab Ce stock a le potentiel de sauver de nombreuses vies et nous sommes impatients de le voir en action. Ces r\u00e9sultats ont \u00e9galement d\u00e9j\u00e0 contribu\u00e9 aux recommandations de l&rsquo;OMS sur l&rsquo;utilisation d&rsquo;un calendrier \u00e0 deux doses \u00bb, conclut Azman.<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;h\u00e9patite E, une maladie virale du foie potentiellement grave, se transmet par l&rsquo;eau contamin\u00e9e. Le<\/p>\n","protected":false},"author":1,"featured_media":3502,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[90,273,517,206,1058,3490,1639,551,1304],"class_list":["post-3501","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-contre","tag-deux","tag-doses","tag-efficace","tag-lhepatite","tag-lieu","tag-savere","tag-trois","tag-vaccination","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 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La vaccination contre l\u2019h\u00e9patite E s\u2019av\u00e8re efficace en deux doses au lieu de trois - RVH-Synergie.org<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rvh-synergie.org\/actualites\/la-vaccination-contre-lhepatite-e-savere-efficace-en-deux-doses-au-lieu-de-trois\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La vaccination contre l\u2019h\u00e9patite E s\u2019av\u00e8re efficace en deux doses au lieu de trois - RVH-Synergie.org\" \/>\n<meta property=\"og:description\" content=\"L&rsquo;h\u00e9patite E, une maladie virale du foie potentiellement grave, se transmet par l&rsquo;eau contamin\u00e9e. 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