{"id":211730,"date":"2021-05-24T22:48:16","date_gmt":"2021-05-24T21:48:16","guid":{"rendered":"https:\/\/www.realites.com.tn\/?p=211730"},"modified":"2021-05-24T22:48:16","modified_gmt":"2021-05-24T21:48:16","slug":"au-bout-de-combien-de-temps-le-vaccin-pfizer-est-il-efficace","status":"publish","type":"post","link":"https:\/\/realites.com.tn\/fr\/au-bout-de-combien-de-temps-le-vaccin-pfizer-est-il-efficace\/","title":{"rendered":"Au bout de combien de temps, le vaccin Pfizer est-il efficace ?"},"content":{"rendered":"
\n
Le risque de forme grave de Covid-19 diminue de 87 % chez les personnes de plus de 75 ans, d\u00e8s 7 jours apr\u00e8s l\u2019injection de la 2e dose, nous apprend la premi\u00e8re \u00e9tude fran\u00e7aise men\u00e9e en vie r\u00e9elle.<\/div>\n
Suite aux essais cliniques, les vaccins ont montr\u00e9 des taux d\u2019efficacit\u00e9 particuli\u00e8rement \u00e9lev\u00e9s, autour de 95% pour limiter les formes graves.<\/div>\n
Mais avec l\u2019avanc\u00e9e des campagnes de vaccination, on commence \u00e0 avoir du recul pour v\u00e9rifier cette efficacit\u00e9 en vie r\u00e9elle. Selon une \u00e9tude Epipharemen\u00e9e avec l\u2019Assurance maladie aupr\u00e8s de 4 millions de personnes dont 1,4 millions de vaccin\u00e9s (en majorit\u00e9 avec Pfizer) \u00ab\u00a0l\u2019impact de la vaccination est majeur\u00a0\u00bb.<\/div>\n
En effet, les premiers r\u00e9sultats montrent que le risque de forme grave de Covid-19 diminue de 87 % chez les personnes de plus de 75 ans, d\u00e8s 7 jours apr\u00e8s l\u2019injection de la 2e dose. Cela signifie qu\u2019elles ont 9 fois moins de risque d’\u00eatre hospitalis\u00e9es pour Covid-19 que les personnes de plus de 75 ans non vaccin\u00e9es.<\/div>\n
Cette forte efficacit\u00e9 n’est pas imm\u00e9diate, selon cette \u00e9tude :<\/div>\n
J1 : d\u00e8s la premi\u00e8re injection, la protection monte \u00e0 59%.<\/div>\n
J1 \u00e0 J13 : ensuite, les deux premi\u00e8res semaines apr\u00e8s l’injection, la protection reste stable en tr\u00e8s l\u00e9g\u00e8re baisse, autour de 56%.<\/div>\n
J14 \u00e0 J41 : la r\u00e9duction du risque est en revanche moindre entre le 14e jour apr\u00e8s la premi\u00e8re dose et l\u2019administration de la deuxi\u00e8me dose (\u00e0 42 jours) : le taux est alors bien plus faible (33%).<\/div>\n
Apr\u00e8s J42 : l’injection de la deuxi\u00e8me dose vient relancer la protection, qui grimpe \u00e0 86% et m\u00eame 87 %, sept jours apr\u00e8s cette deuxi\u00e8me injection (J49).<\/div>\n
Cela sugg\u00e8re qu’il ne faut pas se sentir prot\u00e9g\u00e9 apr\u00e8s la premi\u00e8re dose. C’est bien le sch\u00e9ma complet en deux doses qui assure une protection optimale.<\/div>\n
De plus, selon cette \u00e9tude, la r\u00e9duction de risque apr\u00e8s 7 jours post-deuxi\u00e8me dose est plus marqu\u00e9e chez les personnes \u00e2g\u00e9es de moins de 85 ans par rapport \u00e0 celles \u00e2g\u00e9es de 85 ans et plus.<\/div>\n
<\/div>\n
*L’importance d’une vaccination compl\u00e8te chez les adultes<\/strong><\/div>\n
D’autres pays ont d\u00e9j\u00e0 conduit des \u00e9tudes sur l’efficacit\u00e9 en vie r\u00e9elle des vaccins : elles confirment que le vaccin Pfizer-BioNTech est efficace \u00e0 plus de 95% contre les infections, \u00e0 plus 97% contre les hospitalisations et les d\u00e9c\u00e8s.<\/div>\n
Toutefois, l\u2019\u00e9tude montre une baisse d\u2019efficacit\u00e9 notable chez les personnes qui n’ont re\u00e7u qu’une seule des deux doses : 57,7% contre l’infection, 75,7% contre les hospitalisations et 77% contre les d\u00e9c\u00e8s chez les plus de 16 ans. Cela \u00ab\u00a0montre l’importance d’une vaccination compl\u00e8te chez les adultes\u00a0\u00bb.<\/div>\n
Rappelons enfin que m\u00eame pour les personnes vaccin\u00e9es, l\u2019application des gestes barri\u00e8res et le port du masque restent n\u00e9cessaires.<\/div>\n
(Top Sant\u00e9)<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Le risque de forme grave de Covid-19 diminue de 87 % chez les personnes de plus de 75 ans, d\u00e8s 7 jours apr\u00e8s l\u2019injection de la 2e dose, nous apprend…<\/p>\n","protected":false},"author":60,"featured_media":211731,"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-211730","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sante"],"yoast_head":"\nAu bout de combien de temps, le vaccin Pfizer est-il efficace ? - R\u00e9alit\u00e9s Magazine<\/title>\n<meta name=\"description\" content=\"Le risque de forme grave de Covid-19 diminue de 87 % chez les personnes de plus de 75 ans, d\u00e8s 7 jours apr\u00e8s l\u2019injection de la 2e dose, nous apprend la\" \/>\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\/au-bout-de-combien-de-temps-le-vaccin-pfizer-est-il-efficace\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Au bout de combien de temps, le vaccin Pfizer est-il efficace ? 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