{"id":218248,"date":"2021-09-01T14:56:05","date_gmt":"2021-09-01T13:56:05","guid":{"rendered":"https:\/\/www.realites.com.tn\/?p=218248"},"modified":"2021-09-01T14:56:05","modified_gmt":"2021-09-01T13:56:05","slug":"covid-19-bientot-un-nouveau-vaccin-pour-booster-limmunite","status":"publish","type":"post","link":"https:\/\/realites.com.tn\/fr\/covid-19-bientot-un-nouveau-vaccin-pour-booster-limmunite\/","title":{"rendered":"Covid-19 : bient\u00f4t un nouveau vaccin pour booster l&rsquo;immunit\u00e9 ?"},"content":{"rendered":"<div>Des chercheurs de l&rsquo;Inserm ont d\u00e9velopp\u00e9 un vaccin ciblant des cellules cl\u00e9s du syst\u00e8me immunitaire, afin de \u00ab\u00a0booster\u00a0\u00bb la r\u00e9ponse protectrice de l&rsquo;organisme\u00a0 contre le virus. De premiers essais sur l&rsquo;Homme sont pr\u00e9vus pour 2022.<\/div>\n<div>Alors que des questions se posent encore sur la dur\u00e9e de la r\u00e9ponse immunitaire apr\u00e8s une infection au covid-19 ou la vaccination, ou sur la n\u00e9cessit\u00e9 d&rsquo;avoir une 3e dose de vaccin, des chercheurs de l&rsquo;Inserm, de l&rsquo;Universit\u00e9 Paris-Est Cr\u00e9teil, du CEA et de l&rsquo;Universit\u00e9 Paris-Saclay, en France, ont d\u00e9velopp\u00e9 un nouveau type de vaccin qui cible certaines cellules cl\u00e9s du syst\u00e8me immunitaire appel\u00e9es cellules dendritiques. Dans un premier temps, les chercheurs estiment que ce vaccin pourrait \u00eatre utile pour les personnes convalescentes ou d\u00e9j\u00e0 vaccin\u00e9es dont la r\u00e9ponse immunitaire a commenc\u00e9 \u00e0 d\u00e9cliner, afin de \u00ab\u00a0booster\u00a0\u00bb leur immunit\u00e9.<\/div>\n<div><\/div>\n<div><strong>*Un vaccin qui \u00ab\u00a0restimule\u00a0\u00bb la production d&rsquo;anticorps<\/strong><\/div>\n<div>Dans leur \u00e9tude, parue dans le journal Nature Communication, les scientifiques montrent la capacit\u00e9 de leur candidat vaccin \u00e0 induire des r\u00e9ponses \u00ab\u00a0de rappel\u00a0\u00bb antiCovid-19 chez des macaques convalescents qui avaient contract\u00e9 le SARSCoV-2 six mois plus t\u00f4t. Ce candidat-vaccin, bien tol\u00e9r\u00e9, a induit une forte augmentation des anticorps neutralisants.<\/div>\n<div>\u00ab\u00a0Face \u00e0 une nouvelle exposition au virus, les animaux convalescents et vaccin\u00e9s pr\u00e9sentent une charge virale ind\u00e9tectable ou \u00e9liminent le virus dans un d\u00e9lai plus court (moins de trois jours) comparativement aux animaux convalescents non vaccin\u00e9s ou \u00e0 des animaux t\u00e9moins indemnes de toute infection pr\u00e9alable\u00a0\u00bb pr\u00e9cisent les chercheurs. Par ailleurs, les animaux vaccin\u00e9s ont \u00e9t\u00e9 prot\u00e9g\u00e9s des complications pulmonaires cons\u00e9cutives \u00e0 l&rsquo;infection.<\/div>\n<div>Cette \u00e9tude montre qu&rsquo;une seule administration du candidat vaccin, qui a \u00e9galement \u00e9t\u00e9 test\u00e9 contre les variants, permet de \u00ab\u00a0restimuler \u00ab\u00a0la production d&rsquo;anticorps capables de contr\u00f4ler le virus lors d&rsquo;une \u00e9ventuelle r\u00e9infection.<\/div>\n<div>Ce vaccin pourrait compl\u00e9ter l&rsquo;arsenal des vaccins anti-Covid d\u00e9j\u00e0 disponibles. Des essais cliniques sont pr\u00e9vus en 2022 chez des personnes convalescentes ou d\u00e9j\u00e0 vaccin\u00e9es par un vaccin de premi\u00e8re g\u00e9n\u00e9ration. Ils seront \u00e9galement men\u00e9s chez des individus n&rsquo;ayant jamais \u00e9t\u00e9 expos\u00e9s \u00e0 la vaccination ou au virus.<\/div>\n<div style=\"text-align: right\">(Topsant\u00e9)<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Des chercheurs de l&rsquo;Inserm ont d\u00e9velopp\u00e9 un vaccin ciblant des cellules cl\u00e9s du syst\u00e8me immunitaire, afin de \u00ab\u00a0booster\u00a0\u00bb la r\u00e9ponse protectrice de l&rsquo;organisme\u00a0 contre le virus. De premiers essais sur&hellip;<\/p>\n","protected":false},"author":60,"featured_media":218249,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2515],"tags":[],"class_list":["post-218248","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sante"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Covid-19 : bient\u00f4t un nouveau vaccin pour booster l&#039;immunit\u00e9 ? - R\u00e9alit\u00e9s Magazine<\/title>\n<meta name=\"description\" content=\"Des chercheurs de l&#039;Inserm ont d\u00e9velopp\u00e9 un vaccin ciblant des cellules cl\u00e9s du syst\u00e8me immunitaire, afin de &quot;booster&quot; la r\u00e9ponse protectrice de\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/realites.com.tn\/fr\/covid-19-bientot-un-nouveau-vaccin-pour-booster-limmunite\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Covid-19 : bient\u00f4t un nouveau vaccin pour booster l&#039;immunit\u00e9 ? 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