{"id":19873,"date":"2021-11-12T19:50:29","date_gmt":"2021-11-12T19:50:29","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/?p=19873"},"modified":"2021-11-13T21:24:12","modified_gmt":"2021-11-13T21:24:12","slug":"vaccins-contre-le-covid-19-une-efficacite-qui-peut-chuter-jusqua-43-six-mois-apres-la-2e-dose","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/dossiers\/vaccins-contre-le-covid-19-une-efficacite-qui-peut-chuter-jusqua-43-six-mois-apres-la-2e-dose","title":{"rendered":"Vaccins contre le covid-19: Une efficacit\u00e9 qui peut chuter jusqu\u2019\u00e0 43% six mois apr\u00e8s la 2e dose"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>Selon une r\u00e9cente \u00e9tude, les deux doses de vaccin contre le covid-19 ne prot\u00e8gent plus aussi bien plusieurs mois apr\u00e8s les injections. De plus en plus de personnes pourraient \u00eatre concern\u00e9es par une troisi\u00e8me dose de rappel.<\/p>\n<p>Pour se prot\u00e9ger contre le covid-19, les deux doses de vaccin pourraient ne plus \u00eatre jug\u00e9es suffisantes. Selon une \u00e9tude r\u00e9cemment publi\u00e9e par des chercheurs isra\u00e9liens, l\u2019immunit\u00e9 conf\u00e9r\u00e9e par la vaccination diminue avec le temps. Pour les vaccin\u00e9s de 60 ans et plus, l\u2019efficacit\u00e9 contre la contamination au virus est de 73% quatre mois apr\u00e8s la deuxi\u00e8me injection. Elle tombe \u00e0 57% apr\u00e8s six mois. Une baisse drastique de l\u2019immunit\u00e9 qu\u2019on retrouve dans toutes les tranches d\u2019\u00e2ge. En ce qui concerne les formes graves, l\u2019efficacit\u00e9 d\u2019une double dose reste importante, mais baisse : pour les 40-59 ans, elle est de 94% apr\u00e8s six mois. Elle descend jusqu\u2019\u00e0 86% chez les plus de 60 ans.<\/p>\n<p>Une troisi\u00e8me dose pour de plus en plus de personnes ?<\/p>\n<p>Immunologue au CHU de Saint-Etienne (Loire) et membre du comit\u00e9 scientifique des vaccins covid-19, le professeur St\u00e9phane Paul d\u00e9clare qu\u2019il \u00ab va falloir diminuer un peu l\u2019\u00e2ge \u00e0 partir duquel on va proposer cette troisi\u00e8me dose, probablement autour des 50 ans puisque c\u2019est \u00e0 peu pr\u00e8s \u00e0 cet \u00e2ge-l\u00e0 qu\u2019on voit les plus fortes diminutions des anticorps au bout de six mois \u00bb.<\/p>\n<p>Au 6 novembre, plus de 23% des Fran\u00e7ais n\u2019ont toujours re\u00e7u aucune dose du vaccin contre le covid-19.<\/p>\n<p>France T\u00e9l\u00e9visions<\/p>\n<p>Pfizer, Moderna, Janssen\u2026 Quel que soit le vaccin utilis\u00e9, la protection baisse. Tout le monde est-il concern\u00e9 ? La troisi\u00e8me dose r\u00e9sout-elle le probl\u00e8me ?<\/p>\n<p>Par H\u00e9lo\u00efse Rambert<\/p>\n<p>Le fait \u00e9tait d\u00e9j\u00e0 connu des chercheurs, mais une nouvelle \u00e9tude am\u00e9ricaine publi\u00e9e dans la revue Science le 4 novembre dernier, le confirme : les mois passant, la protection contre le Covid-19 s\u2019\u00e9mousse.<\/p>\n<p>Les auteurs ont men\u00e9 une \u00e9tude sur plus de 780 000 v\u00e9t\u00e9rans vaccin\u00e9s soit par une dose de Janssen, soit par deux doses de Moderna ou de Pfizer. Entre f\u00e9vrier et octobre, la protection offerte par ces vaccins contre l\u2019infection est pass\u00e9e de 87,9 % \u00e0 48,1 %. Plus pr\u00e9cis\u00e9ment, au mois de mars, les vaccins Janssen, Moderna et Pfizer affichaient respectivement une efficacit\u00e9 de 86,4 %, 89,9 % et 86,9 %. Six mois plus tard, elle n\u2019\u00e9tait plus que de 13,1 %, 58 % et 43,3 %. En revanche, la vaccination est rest\u00e9e beaucoup plus protectrice contre les formes s\u00e9v\u00e8res et les d\u00e9c\u00e8s.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/cotedivoire\">C\u00f4te d&rsquo;Ivoire<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Selon une r\u00e9cente \u00e9tude, les deux doses de vaccin contre le covid-19 ne prot\u00e8gent plus aussi bien plusieurs mois apr\u00e8s les injections. De plus en plus de personnes pourraient \u00eatre concern\u00e9es par une troisi\u00e8me dose de rappel. Pour se prot\u00e9ger contre le covid-19, les deux doses de vaccin pourraient ne plus [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":19872,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,11,10],"tags":[56,63,29],"class_list":["post-19873","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dossiers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-cote-divoire","tag-cote-divoire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Vaccins contre le covid-19: Une efficacit\u00e9 qui peut chuter jusqu\u2019\u00e0 43% six mois apr\u00e8s la 2e dose - C\u00f4te d&#039;Ivoire<\/title>\n<meta name=\"description\" content=\"Selon une r\u00e9cente \u00e9tude, les deux doses de 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