{"id":223683,"date":"2021-11-18T20:33:56","date_gmt":"2021-11-18T19:33:56","guid":{"rendered":"https:\/\/www.realites.com.tn\/?p=223683"},"modified":"2021-11-18T20:33:56","modified_gmt":"2021-11-18T19:33:56","slug":"covid-19-quel-vaccin-genere-le-plus-danticorps","status":"publish","type":"post","link":"https:\/\/realites.com.tn\/fr\/covid-19-quel-vaccin-genere-le-plus-danticorps\/","title":{"rendered":"Covid-19 : quel vaccin g\u00e9n\u00e8re le plus d&rsquo;anticorps ?"},"content":{"rendered":"<div>Plusieurs \u00e9tudes se sont d\u00e9j\u00e0 attach\u00e9es \u00e0 \u00e9valuer l&rsquo;efficacit\u00e9 des diff\u00e9rents vaccins. En juillet, une \u00e9tude britannique avait constat\u00e9 une efficacit\u00e9 de 88 % avec le Pfizer contre le variant Delta, et de 67 % avec l&rsquo;AstraZeneca. Une autre \u00e9tude montre des r\u00e9sultats tr\u00e8s diff\u00e9rents et affirme que le Moderna serait deux fois plus efficace que le Pfizer. Dans une nouvelle \u00e9tude, publi\u00e9e dans le journal Cell Host, les chercheurs ont compar\u00e9 l&rsquo;efficacit\u00e9 de quatre vaccins : Pfizer, AstraZeneca, le russe Spoutnik V et le chinois Sinopharm. Les chercheurs ont analys\u00e9 le taux d&rsquo;anticorps neutralisants chez un \u00e9chantillon de patients vaccin\u00e9s en Mongolie entre le 3 et le 7 juillet 2021 (date \u00e0 laquelle circulait principalement le variant Alpha dans le pays). R\u00e9sultat, le taux d&rsquo;anticorps immunisants est le plus \u00e9lev\u00e9 avec le Pfizer, suivi de l&rsquo;AstraZeneca, du Spoutnik V et du Sinopharm, bon dernier.<\/div>\n<div>Plusieurs facteurs peuvent expliquer ces diff\u00e9rences. D&rsquo;abord la technologie employ\u00e9e : le Pfizer est un vaccin \u00e0 ARN, l&rsquo;AstraZeneca et le Spoutnik V utilisent un vecteur d&rsquo;ad\u00e9novirus modifi\u00e9, et le Sinopharm fonctionne \u00e0 partir d&rsquo;un virus SARS-CoV-2 inactiv\u00e9. La quantit\u00e9 de s\u00e9rum peut \u00e9galement jouer une diff\u00e9rence, ainsi que l&rsquo;intervalle entre chaque dose ou d&rsquo;autres facteurs confondants. Le Direct Investment Fund, qui a financ\u00e9 le vaccin Spoutnik V, s&rsquo;insurge ainsi contre ces r\u00e9sultats qu&rsquo;il estime biais\u00e9s, parce que les b\u00e9n\u00e9ficiaires de son vaccin dans l&rsquo;\u00e9tude ont 10 ans de plus que la moyenne (ce qui peut expliquer pourquoi leur r\u00e9ponse immunitaire est moins forte). Limit\u00e9e dans le temps, cette \u00e9tude ne nous dit rien non plus sur l&rsquo;\u00e9volution \u00e0 long terme. Une autre \u00e9tude avait montr\u00e9 en ao\u00fbt que l&rsquo;efficacit\u00e9 du vaccin Pfizer pour pr\u00e9venir les infections diminuait plus rapidement que celle du vaccin d&rsquo;AstraZeneca.<\/div>\n<div>Le plus efficace est finalement sans doute de m\u00e9langer les diff\u00e9rents vaccins. Selon une \u00e9tude sud-cor\u00e9enne, un sch\u00e9ma de vaccination avec une dose d&rsquo;AstraZeneca suivie d&rsquo;une dose de Pfizer\/BioNTech multiplie par six le niveau d&rsquo;anticorps neutralisants par rapport \u00e0 deux doses d&rsquo;AstraZeneca.<\/div>\n<div style=\"text-align: right\">(FuturaSant\u00e9)<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Plusieurs \u00e9tudes se sont d\u00e9j\u00e0 attach\u00e9es \u00e0 \u00e9valuer l&rsquo;efficacit\u00e9 des diff\u00e9rents vaccins. En juillet, une \u00e9tude britannique avait constat\u00e9 une efficacit\u00e9 de 88 % avec le Pfizer contre le variant&hellip;<\/p>\n","protected":false},"author":60,"featured_media":223684,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[7],"tags":[],"class_list":["post-223683","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-monde"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Covid-19 : quel vaccin g\u00e9n\u00e8re le plus d&#039;anticorps ? - R\u00e9alit\u00e9s Magazine<\/title>\n<meta name=\"description\" content=\"Plusieurs \u00e9tudes se sont d\u00e9j\u00e0 attach\u00e9es \u00e0 \u00e9valuer l&#039;efficacit\u00e9 des diff\u00e9rents vaccins. En juillet, une \u00e9tude britannique avait constat\u00e9 une efficacit\u00e9 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-quel-vaccin-genere-le-plus-danticorps\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Covid-19 : quel vaccin g\u00e9n\u00e8re le plus d&#039;anticorps ? - R\u00e9alit\u00e9s Magazine\" \/>\n<meta property=\"og:description\" content=\"Plusieurs \u00e9tudes se sont d\u00e9j\u00e0 attach\u00e9es \u00e0 \u00e9valuer l&#039;efficacit\u00e9 des diff\u00e9rents vaccins. 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