{"id":9195,"date":"2021-02-25T18:35:25","date_gmt":"2021-02-25T17:35:25","guid":{"rendered":"https:\/\/www.culturalusa.com\/news\/?p=9195"},"modified":"2021-02-25T18:38:52","modified_gmt":"2021-02-25T17:38:52","slug":"coronavirus-une-nouvelle-etude-confirme-lefficacite-du-vaccin-de-pfizer","status":"publish","type":"post","link":"https:\/\/www.culturalusa.com\/news\/technologie\/coronavirus-une-nouvelle-etude-confirme-lefficacite-du-vaccin-de-pfizer\/","title":{"rendered":"CoronaVirus: Une nouvelle \u00e9tude confirme l\u2019efficacit\u00e9 du vaccin de Pfizer"},"content":{"rendered":"<p>Covid-19: cette \u00e9tude de grande ampleur a \u00e9t\u00e9 men\u00e9e en Isra\u00ebl sur 1,2 million de personnes, \u00e0 un moment o\u00f9 le variant britannique circulait dans le pays.<\/p>\n<blockquote><p>Une nouvelle \u00e9tude vient confirmer l&rsquo;efficacit\u00e9 du vaccin d\u00e9velopp\u00e9 par Pfizer contre le Covid-19. Les r\u00e9sultats, publi\u00e9s mercredi 24 f\u00e9vrier, montrent que ce vaccin est efficace \u00e0 94 % contre les cas symptomatiques de Covid-19.<\/p><\/blockquote>\n<p><strong>\u00ab\u00a0Il s&rsquo;agit de la premi\u00e8re preuve valid\u00e9e par les pairs de l&rsquo;efficacit\u00e9 d&rsquo;un vaccin dans les conditions du monde r\u00e9el \u00ab\u00a0,<\/strong> a d\u00e9clar\u00e9 \u00e0 l&rsquo;Agence France-Presse Ben Reis, l&rsquo;un des coauteurs de cette \u00e9tude publi\u00e9e dans le prestigieux New England Journal of Medicine.<\/p>\n<p>Jusqu&rsquo;ici, l&rsquo;efficacit\u00e9 du vaccin a \u00e9t\u00e9 prouv\u00e9e par des essais cliniques r\u00e9alis\u00e9s sur des milliers de personnes, mais pas dans des conditions r\u00e9elles, qui impliquent une plus grande vari\u00e9t\u00e9 de personnes et de comportements ou encore des d\u00e9fis logistiques comme le maintien de la cha\u00eene du froid.<\/p>\n<p><strong>L&rsquo;\u00e9tude a \u00e9t\u00e9 men\u00e9e \u00e0 partir des donn\u00e9es de quelque 1,2 million de personnes soign\u00e9es par l&rsquo;un des plus gros organismes de sant\u00e9 d&rsquo;Isra\u00ebl (Clalit Health Services)<\/strong> entre le 20 d\u00e9cembre 2020 et le 1er f\u00e9vrier 2021. \u00c0 ce moment-l\u00e0, le variant britannique circulait largement dans le pays, rendant ces r\u00e9sultats d&rsquo;autant plus int\u00e9ressants.<\/p>\n<h3>Comparaison de deux groupes<\/h3>\n<p>Pr\u00e8s de 600 000 personnes ayant re\u00e7u le vaccin ont \u00e9t\u00e9 \u00ab associ\u00e9es \u00bb tr\u00e8s rigoureusement \u00e0 quelque 600 000 autres n&rsquo;ayant pas re\u00e7u l&rsquo;injection, et pr\u00e9sentant des caract\u00e9ristiques tr\u00e8s similaires en termes de sexe, d&rsquo;\u00e2ge, mais aussi de comorbidit\u00e9s et de lieu d&rsquo;habitation.<\/p>\n<p>En comparant les deux groupes, les auteurs montrent que la vaccination a r\u00e9duit de 94 % les cas symptomatiques du Covid-19, de 92 % les cas graves de la maladie et de 87 % les hospitalisations. Ces taux valent pour la protection obtenue au moins sept jours apr\u00e8s la seconde injection.<\/p>\n<blockquote><p>Mais \u00ab\u00a0un effet assez cons\u00e9quent a \u00e9t\u00e9 observ\u00e9 avant m\u00eame la seconde dose\u00a0\u00bb, a relev\u00e9 aupr\u00e8s de l&rsquo;Agence France-Presse Noam Barda, l&rsquo;un des deux auteurs principaux, avec une efficacit\u00e9 de 57 % pour les cas de Covid-19 avec sympt\u00f4mes et de 62 % pour les cas graves.<\/p><\/blockquote>\n<p>Le vaccin \u00e9tait \u00e9galement efficace \u00e0 72 % pour emp\u00eacher les d\u00e9c\u00e8s du Covid-19 apr\u00e8s la premi\u00e8re dose, mais leur faible nombre dans cette \u00e9tude rend ce r\u00e9sultat moins fiable. L&rsquo;efficacit\u00e9 \u00e9tait relativement constante pour tous les groupes d&rsquo;\u00e2ge, \u00ab\u00a0y compris les personnes \u00e2g\u00e9es de plus de 70 ans\u00a0\u00bb, a pr\u00e9cis\u00e9 Ben Reis.<\/p>\n<p>En revanche, \u00ab\u00a0nous avons des indications montrant que, pour les personnes ayant beaucoup de maladies (ant\u00e9rieures), le vaccin marche l\u00e9g\u00e8rement moins bien\u00a0\u00bb.<\/p>\n<h3>La fin de la possibilit\u00e9 d&rsquo;\u00eatre infect\u00e9 ?<\/h3>\n<p>Par ailleurs, l&rsquo;\u00e9tude rapporte une efficacit\u00e9 de 92 % contre la possibilit\u00e9 m\u00eame d&rsquo;\u00eatre infect\u00e9 (et non seulement de d\u00e9velopper des sympt\u00f4mes). Une donn\u00e9e cruciale, car, si elle \u00e9tait confirm\u00e9e, elle pourrait indiquer que les personnes vaccin\u00e9es ne peuvent plus non plus transmettre le virus. Mais ce r\u00e9sultat doit \u00eatre pris avec prudence, de l&rsquo;aveu m\u00eame des auteurs.<\/p>\n<p>Il est encourageant mais, dans le m\u00eame temps, \u00ab\u00a0cette \u00e9tude ne peut pas garantir que nous ayons d\u00e9tect\u00e9 toutes les infections asymptomatiques\u00a0\u00bb, a averti Noam Barda. Pour cela, il faudrait que tous les participants soient tr\u00e8s r\u00e9guli\u00e8rement test\u00e9s, de fa\u00e7on proactive, ce qui n&rsquo;a pas \u00e9t\u00e9 le cas ici. Une autre \u00e9tude de Clalit en ce sens est en cours. (AFP)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Covid-19: cette \u00e9tude de grande ampleur a \u00e9t\u00e9 men\u00e9e en Isra\u00ebl sur 1,2 million de personnes, \u00e0 un moment o\u00f9 le variant britannique circulait dans le pays. Une nouvelle \u00e9tude vient confirmer l&rsquo;efficacit\u00e9 du vaccin d\u00e9velopp\u00e9 par Pfizer contre le Covid-19. Les r\u00e9sultats, publi\u00e9s mercredi 24 f\u00e9vrier, montrent que ce vaccin est efficace \u00e0 94 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":8389,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[1672,1269,1671],"class_list":["post-9195","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologie","tag-efficacite-du-vaccin-pfizer","tag-vaccin-anti-covid-19","tag-vaccin-pfizer"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Covid-19: cette \u00e9tude de grande ampleur a \u00e9t\u00e9 men\u00e9e en Isra\u00ebl sur 1,2 million de personnes, \u00e0 un moment o\u00f9 le variant britannique circulait dans le pays. Une nouvelle \u00e9tude vient confirmer l&#039;efficacit\u00e9 du vaccin d\u00e9velopp\u00e9 par Pfizer contre le Covid-19. 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