{"id":217505,"date":"2021-08-19T23:41:58","date_gmt":"2021-08-19T22:41:58","guid":{"rendered":"https:\/\/www.realites.com.tn\/?p=217505"},"modified":"2021-08-19T23:41:58","modified_gmt":"2021-08-19T22:41:58","slug":"lefficacite-de-pfizer-decline-plus-vite-quastrazeneca-face-au-variant-delta","status":"publish","type":"post","link":"https:\/\/realites.com.tn\/fr\/lefficacite-de-pfizer-decline-plus-vite-quastrazeneca-face-au-variant-delta\/","title":{"rendered":"L&rsquo;efficacit\u00e9 de Pfizer d\u00e9cline plus vite qu&rsquo;AstraZeneca face au variant Delta"},"content":{"rendered":"<div>Le vaccin de Pfizer\/BioNtech est plus efficace pour lutter contre les infections li\u00e9es au variant Delta du coronavirus que celui d&rsquo;Oxford\/AstraZeneca, mais son efficacit\u00e9 d\u00e9cline plus rapidement, r\u00e9v\u00e8le ce jeudi 19 ao\u00fbt une \u00e9tude britannique. Les chercheurs de l&rsquo;universit\u00e9 d&rsquo;Oxford, qui a co-d\u00e9velopp\u00e9 l&rsquo;un des deux s\u00e9rums, ont examin\u00e9 entre d\u00e9cembre 2020 et ao\u00fbt 2021 des pr\u00e9l\u00e8vements effectu\u00e9s sur plus de 700.000 participants.<\/div>\n<div>Cette analyse a r\u00e9v\u00e9l\u00e9 que, pour les infections \u00e0 charge virale \u00e9lev\u00e9e, un individu ayant re\u00e7u sa deuxi\u00e8me dose de vaccin Pfizer un mois auparavant \u00e9tait 90% plus prot\u00e9g\u00e9 contre le variant Delta qu&rsquo;une personne non vaccin\u00e9e. Ce chiffre tombe \u00e0 85% apr\u00e8s deux mois, puis \u00e0 78% apr\u00e8s trois mois. Les personnes ayant re\u00e7u les deux injections du vaccin AstraZeneca sont elles prot\u00e9g\u00e9es \u00e0 67% apr\u00e8s un mois, 65% apr\u00e8s deux mois et 61% apr\u00e8s trois mois. Apr\u00e8s quatre \u00e0 cinq mois, le niveau de protection offert par les deux vaccins devient similaire selon l&rsquo;\u00e9tude, qui n&rsquo;a pas encore \u00e9t\u00e9 valid\u00e9e par des pairs.<\/div>\n<div>Ces chiffres \u00ab\u00a0repr\u00e9sentent vraiment un d\u00e9clin\u00a0\u00bb d&rsquo;efficacit\u00e9 pour le vaccin de Pfizer, a expliqu\u00e9 le docteur Koen Pouwels, qui a travaill\u00e9 sur l&rsquo;\u00e9tude, tandis que pour AstraZeneca \u00ab\u00a0les diff\u00e9rences (d&rsquo;un mois \u00e0 l&rsquo;autre) sont li\u00e9es au hasard, c&rsquo;est-\u00e0-dire qu&rsquo;il pourrait n&rsquo;y avoir aucun changement dans la protection\u00a0\u00bb. Le chercheur a tout de m\u00eame insist\u00e9 sur le fait que malgr\u00e9 \u00ab\u00a0ces baisses l\u00e9g\u00e8res de protection\u00a0\u00bb, \u00ab\u00a0l&rsquo;efficacit\u00e9 globale (des deux vaccins) reste tr\u00e8s \u00e9lev\u00e9e\u00a0\u00bb, soulignant que les chercheurs avaient \u00e9tudi\u00e9 la protection globale et non le niveau de protection contre les formes graves et hospitalisations, \u00ab\u00a0deux donn\u00e9es tr\u00e8s importantes pour \u00e9valuer l&rsquo;efficacit\u00e9 des vaccins\u00a0\u00bb.<\/div>\n<div>Cette \u00e9tude intervient alors que plusieurs pays, dont le Royaume-Uni, envisagent de lancer une campagne de rappel avec une troisi\u00e8me dose du vaccin. Le gouvernement britannique a ainsi annonc\u00e9 fin avril avoir acquis 60 millions de nouvelles doses du vaccin Pfizer afin de mettre en place \u00e0 l&rsquo;automne un programme de rappel \u00e0 destination des personnes les plus vuln\u00e9rables.<\/div>\n<div style=\"text-align: right\">(Capital)<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Le vaccin de Pfizer\/BioNtech est plus efficace pour lutter contre les infections li\u00e9es au variant Delta du coronavirus que celui d&rsquo;Oxford\/AstraZeneca, mais son efficacit\u00e9 d\u00e9cline plus rapidement, r\u00e9v\u00e8le ce jeudi&hellip;<\/p>\n","protected":false},"author":60,"featured_media":217506,"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-217505","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 - 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