{"id":11415,"date":"2021-08-25T17:45:49","date_gmt":"2021-08-25T15:45:49","guid":{"rendered":"https:\/\/ozinzen.com\/blog\/?p=11415"},"modified":"2021-09-02T16:53:30","modified_gmt":"2021-09-02T14:53:30","slug":"vaccination-atteindre-limmunite-collective-contre-le-covid-19-est-mathematiquement-impossible-voici-pourquoi","status":"publish","type":"post","link":"https:\/\/ozinzen.com\/blog\/vaccination-atteindre-limmunite-collective-contre-le-covid-19-est-mathematiquement-impossible-voici-pourquoi\/","title":{"rendered":"Vaccination : atteindre l\u2019immunit\u00e9 collective contre le covid-19 est math\u00e9matiquement impossible, voici pourquoi"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/ozinzen.com\/blog\/wp-content\/uploads\/2021\/08\/covid19.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/ozinzen.com\/blog\/wp-content\/uploads\/2021\/08\/covid19-1024x576.jpg\" alt=\"\" class=\"wp-image-11417\" srcset=\"https:\/\/ozinzen.com\/blog\/wp-content\/uploads\/2021\/08\/covid19-1024x576.jpg 1024w, https:\/\/ozinzen.com\/blog\/wp-content\/uploads\/2021\/08\/covid19-300x169.jpg 300w, https:\/\/ozinzen.com\/blog\/wp-content\/uploads\/2021\/08\/covid19-768x432.jpg 768w, https:\/\/ozinzen.com\/blog\/wp-content\/uploads\/2021\/08\/covid19.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p>Pour calculer le pourcentage de sujets immunis\u00e9s n\u00e9cessaire pour obtenir l\u2019immunit\u00e9 collective, il existe une formule simple : Immunit\u00e9 collective = 1 \u2013 1\/R0.<\/p>\n\n\n\n<p>Prononc\u00e9 \u00ab R z\u00e9ro \u00bb, le R0, ou nombre de reproduction de base, indique le nombre moyen de nouveaux cas d\u2019une maladie qu\u2019une seule personne infect\u00e9e et contagieuse va g\u00e9n\u00e9rer en moyenne dans une population sans aucune immunit\u00e9 (on appelle les gens sans immunit\u00e9 des personnes susceptibles).<\/p>\n\n\n\n<!--more-->\n\n\n\n<p>Un R0 \u00e9gal \u00e0 2 signifie que pour une personne infect\u00e9e par un virus, cette personne aurait infect\u00e9 en moyenne 2 nouvelles personnes. Et ainsi de suite le virus se transmet de plus en plus.<\/p>\n\n\n\n<p>Dans cet exemple fictif, pour stopper la propagation de ce virus (un virus qui a un R0 de 2 comme la grippe saisonni\u00e8re), il faut 50 % de personnes immunis\u00e9es.<\/p>\n\n\n\n<p>Concernant le covid-19, l\u2019arriv\u00e9e du variant Delta, aujourd\u2019hui majoritaire et dominant, a chang\u00e9 la donne par sa contagiosit\u00e9 et sa virulence accrues.<\/p>\n\n\n\n<p>Claude-Alexandre Gustave, biologiste m\u00e9dical, ancien assistant hospitalo-universitaire en microbiologie et ancien assistant sp\u00e9cialiste en immunologie a fait les calculs : \u00ab Le variant Delta a un R0 de 8. Pour atteindre l\u2019immunit\u00e9 collective, il faudrait vacciner 92 % de la population avec un hypoth\u00e9tique vaccin efficace \u00e0 97 % contre la transmission. \u00bb<\/p>\n\n\n\n<p>Mais les vaccins contre le Covid-19 ne r\u00e9duisent la contagiosit\u00e9 du Delta que de 6 \u00e0 8 fois. De plus, cette formule ne prend pas en compte la diminution de l\u2019immunit\u00e9 dans le temps, l\u2019\u00e9mergence de nouveaux variants ou encore le fait que les enfants ne sont pas vaccin\u00e9s pour le moment.<\/p>\n\n\n\n<p>\u00ab Autant dire qu\u2019atteindre l\u2019immunit\u00e9 collective est math\u00e9matiquement impossible \u00bb, affirme Claude-Alexandre Gustave.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>La vaccination seule est insuffisante<\/strong><\/p>\n\n\n\n<p>Affirmer aujourd\u2019hui que l\u2019immunit\u00e9 collective par la seule vaccination est un objectif inatteignable est politiquement difficile : cela force \u00e0 revoir toute la communication qui a \u00e9t\u00e9 faite autour des vaccins comme moyen de vivre \u00ab comme avant \u00bb.<\/p>\n\n\n\n<p>De plus, cette assertion pourrait \u00eatre per\u00e7ue par certaines personnes comme une remise en question de l\u2019efficacit\u00e9 de la vaccination. Cette lecture serait erron\u00e9e. En effet, si la situation a chang\u00e9 et que la vaccination en elle-m\u00eame ne suffit plus, elle reste efficace pour ralentir la propagation du virus.<\/p>\n\n\n\n<p>\u00ab La vaccination permet de diminuer la pression hospitali\u00e8re\u00bb, explique \u00c9ric Billy, chercheur en immuno-oncologie \u00e0 Strasbourg, membre fondateur du collectif Du c\u00f4t\u00e9 de la science. \u00ab Se faisant, elle permet de mani\u00e8re indirecte d\u2019\u00e9viter des d\u00e9programmations de soins et de pouvoir continuer \u00e0 prendre en charge le plus grand nombre. Ainsi, elle permet \u00e9galement d\u2019\u00e9viter de nouveaux reconfinements avec les cons\u00e9quences \u00e9conomiques et sociales que l\u2019on connait \u00bb, pr\u00e9cise-t-il.<\/p>\n\n\n\n<p>Et d\u2019insister : \u00ab Sans les vaccins, la situation sanitaire serait aujourd\u2019hui absolument dramatique. \u00bb<\/p>\n\n\n\n<p>La vaccination diminue par ailleurs la transmission car elle r\u00e9duit le volume et le temps d\u2019excr\u00e9tion virale des personnes contamin\u00e9es. En ce sens, elle prot\u00e8ge les autres. Imparfaitement cependant.<\/p>\n\n\n\n<p>\u00ab Avec une large couverture vaccinale, on pourra mettre en place des adaptations peu contraignantes et peu liberticides\u00bb, pr\u00e9cise Claude-Alexandre Gustave. Pour \u00c9ric Billy, la vaccination reste une des tranches essentielles dans le mod\u00e8le emmental. Parmi les autres couches de protection, les deux experts insistent sur :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>le port du masque en lieu clos \u2014 que l\u2019on soit vaccin\u00e9 ou non<\/li><li>l\u2019a\u00e9ration\/ventilation de ces lieux clos<\/li><li>l\u2019\u00e9quipement des restaurants et bars de ventilations m\u00e9caniques contr\u00f4l\u00e9es (VMC) avec extracteur<\/li><li>les tests virologiques<\/li><li>l\u2019isolement des personnes contamin\u00e9es<\/li><li>le contact tracing<\/li><\/ul>\n\n\n\n<p>\u00ab Il faut avoir une communication globale et exposer les b\u00e9n\u00e9fices et les limites de chacune des mesures \u00bb, explique le chercheur en immuno-oncologie \u00c9ric Billy.<\/p>\n\n\n\n<p>Le retour \u00e0 une vie \u00ab normale \u00bb n\u2019est pas pour tout de suite, note Claude-Alexandre Gustave.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour calculer le pourcentage de sujets immunis\u00e9s n\u00e9cessaire pour obtenir l\u2019immunit\u00e9 collective, il existe une formule simple : Immunit\u00e9 collective = 1 \u2013 1\/R0. Prononc\u00e9 \u00ab R z\u00e9ro \u00bb, le R0, ou nombre de reproduction de base, indique le nombre moyen de nouveaux cas d\u2019une maladie qu\u2019une seule personne infect\u00e9e et contagieuse va g\u00e9n\u00e9rer en [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":11417,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[27],"tags":[],"class_list":{"0":"post-11415","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-sante","8":"entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Vaccination : atteindre l\u2019immunit\u00e9 collective contre le covid-19 est math\u00e9matiquement impossible, voici pourquoi - 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