{"id":11709,"date":"2025-11-14T05:02:37","date_gmt":"2025-11-14T04:02:37","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/les-anticorps-monoclonaux-previennent-efficacement-le-virus-respiratoire-syncytial-chez-les-nourrissons\/"},"modified":"2025-11-14T05:02:44","modified_gmt":"2025-11-14T04:02:44","slug":"les-anticorps-monoclonaux-previennent-efficacement-le-virus-respiratoire-syncytial-chez-les-nourrissons","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/les-anticorps-monoclonaux-previennent-efficacement-le-virus-respiratoire-syncytial-chez-les-nourrissons\/","title":{"rendered":"Les anticorps monoclonaux pr\u00e9viennent efficacement le virus respiratoire syncytial chez les nourrissons"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/rsv.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/rsv.jpg\" data-sub-html=\"Credit: Unsplash\/CC0 Public Domain\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Le virus respiratoire syncytial (VRS) est un virus respiratoire courant qui provoque g\u00e9n\u00e9ralement de l\u00e9gers sympt\u00f4mes semblables \u00e0 ceux du rhume pendant la saison des virus respiratoires. Cependant, en particulier chez les jeunes nourrissons de moins de six mois ou chez les personnes de plus de 65 ans, l&rsquo;infection par le RSV peut devenir plus grave.<\/p>\n<p>Les complications de sant\u00e9 associ\u00e9es au VRS comprennent la bronchiolite (inflammation des petites voies respiratoires des poumons), la pneumonie ou m\u00eame la septic\u00e9mie, qui peuvent n\u00e9cessiter des s\u00e9jours hospitaliers prolong\u00e9s.<\/p>\n<p>Les produits de vaccination destin\u00e9s \u00e0 pr\u00e9venir la maladie \u00e0 RSV chez les nourrissons et les personnes \u00e2g\u00e9es sont autoris\u00e9s dans l&rsquo;Union europ\u00e9enne depuis 2022. Il s&rsquo;agit notamment des anticorps monoclonaux \u00e0 action prolong\u00e9e qui sont administr\u00e9s aux nouveau-n\u00e9s pendant la saison hivernale ainsi que des vaccins destin\u00e9s aux personnes enceintes pour prot\u00e9ger les nouveau-n\u00e9s pendant leur premi\u00e8re saison hivernale apr\u00e8s la naissance. La saison europ\u00e9enne du VRS est revenue \u00e0 la saisonnalit\u00e9 pr\u00e9-pand\u00e9mique, qui s&rsquo;\u00e9tend d&rsquo;octobre \u00e0 avril environ.<\/p>\n<p>Dans leur communication rapide publi\u00e9e dans <i>Eurosurveillance,<\/i> Savulescu et coll. a examin\u00e9 les donn\u00e9es de trois pays europ\u00e9ens dot\u00e9s de programmes de vaccination contre le VRS en place au cours de la saison hivernale 2024-2025 pour \u00e9tablir l&rsquo;efficacit\u00e9 de l&rsquo;anticorps monoclonal \u00e0 action prolong\u00e9e (nirsevimab) contre l&rsquo;infection par le VRS.<\/p>\n<h2>La vaccination des nourrissons pr\u00e9vient efficacement les hospitalisations li\u00e9es au VRS<\/h2>\n<p>Pour leur \u00e9tude cas-t\u00e9moins aupr\u00e8s d\u2019enfants de moins de deux ans, les auteurs ont examin\u00e9 les donn\u00e9es de 4\u00a0102 enfants hospitalis\u00e9s en Belgique, au Portugal et en Espagne entre septembre 2024 et mai 2025. Parmi eux, 791 enfants test\u00e9s positifs au RSV ont \u00e9t\u00e9 inclus dans l\u2019analyse de l\u2019\u00e9tude et 1\u00a0410 enfants test\u00e9s n\u00e9gatifs au RSV dans le groupe t\u00e9moin.<\/p>\n<p>Dans l\u2019\u00e9tude, les enfants \u00e9taient consid\u00e9r\u00e9s comme immunis\u00e9s s\u2019ils avaient re\u00e7u du nirsevimab entre septembre 2024 et mai 2025 avant le test, quels que soient la dose, leur \u00e2ge et leur poids au moment de la vaccination.<\/p>\n<p>Sur la base de leur analyse, les chercheurs concluent que \u00ab la vaccination des enfants apr\u00e8s la naissance a efficacement emp\u00each\u00e9 les hospitalisations li\u00e9es au VRS chez les enfants au cours de la saison hivernale europ\u00e9enne 2024-2025 \u00bb. Parmi 2 201 enfants, l&rsquo;efficacit\u00e9 globale de la vaccination \u00e9tait de 79 %, ce qui signifie que la r\u00e9ception d&rsquo;anticorps monoclonaux \u00e0 action prolong\u00e9e a r\u00e9duit de mani\u00e8re significative le risque d&rsquo;hospitalisation due \u00e0 une infection par le VRS dans ce groupe d&rsquo;\u00e2ge.<\/p>\n<h2>Les niveaux de protection diminuent progressivement plusieurs mois apr\u00e8s la vaccination<\/h2>\n<p>Cependant, le niveau de protection a diminu\u00e9 au fil du temps apr\u00e8s la vaccination : passant de 85 % pendant le premier mois (<30 jours) apr\u00e8s la vaccination \u00e0 78 % pendant les jours 30 \u00e0 89 apr\u00e8s la vaccination et 69 % apr\u00e8s trois mois (90 \u00e0 215 jours) apr\u00e8s la vaccination.<\/p>\n<p>Chez les nourrissons \u00e2g\u00e9s de 0 \u00e0 6 mois, c&rsquo;est-\u00e0-dire les nouveau-n\u00e9s les plus expos\u00e9s au risque de maladie grave \u00e0 VRS, l&rsquo;efficacit\u00e9 globale de la vaccination avec des anticorps monoclonaux \u00e0 action prolong\u00e9e \u00e9tait de 80 %. Les auteurs soulignent que \u00ab l\u2019efficacit\u00e9 selon le temps \u00e9coul\u00e9 depuis la vaccination doit \u00eatre surveill\u00e9e au cours des saisons futures \u00bb.<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t\t\tFourni par le Centre europ\u00e9en de pr\u00e9vention et de contr\u00f4le des maladies (ECDC)<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Le virus respiratoire syncytial (VRS) est un virus respiratoire courant qui provoque g\u00e9n\u00e9ralement de l\u00e9gers<\/p>\n","protected":false},"author":1,"featured_media":11710,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[2005,56,2909,49,5769,2032,1695,2441,7673,630],"class_list":["post-11709","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-anticorps","tag-chez","tag-efficacement","tag-les","tag-monoclonaux","tag-nourrissons","tag-previennent","tag-respiratoire","tag-syncytial","tag-virus","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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