{"id":4195,"date":"2021-06-09T09:44:37","date_gmt":"2021-06-09T07:44:37","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=4195"},"modified":"2021-06-09T10:46:42","modified_gmt":"2021-06-09T08:46:42","slug":"vaccination-quel-objectif-maintenant","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/06\/09\/vaccination-quel-objectif-maintenant\/","title":{"rendered":"Vaccination : quel objectif maintenant ?"},"content":{"rendered":"\n<p>D\u00e9but juin, plus de la moiti\u00e9 des adultes fran\u00e7ais avaient re\u00e7u au moins une dose d\u2019un vaccin contre le COVID 19. La campagne se poursuivait \u00e0 bon train, avec plus de 700&nbsp;000 injections certains jours. Maintenant que les livraisons de vaccins se succ\u00e8dent \u00e0 un rythme soutenu, <a rel=\"noreferrer noopener\" href=\"https:\/\/twitter.com\/GuillaumeRozier\/status\/1400895748951130116\" target=\"_blank\">certains s\u2019inqui\u00e8tent<\/a> \u00e0 bon droit du risque de manque de volontaires \u00e0 la vaccination.<\/p>\n\n\n\n<p>Rappelons que la vaccination a un double objectif. D\u2019abord, elle diminue pour la personne vaccin\u00e9e le risque de d\u00e9velopper une forme grave de la maladie. Ensuite, elle participe \u00e0 l\u2019immunit\u00e9 collective et prot\u00e8ge ainsi les personnes qui ne peuvent \u00eatre vaccin\u00e9es pour des raisons diverses. Ceux qui ont d\u00e9j\u00e0 eu la Covid sont immunis\u00e9s pour un temps, mais un rappel est vivement conseill\u00e9 pour que ce soit durable.<\/p>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/04\/24\/immunite-collective\/\" target=\"_blank\">L\u2019immunit\u00e9 collective<\/a>, c\u2019est bien pratique, elle permet de revivre ensemble sans contrainte sanitaire. Des pays asiatiques qui ont su limiter fortement le nombre de cas Covid par des mesures fortes sont aujourd\u2019hui <a rel=\"noreferrer noopener\" href=\"https:\/\/www.lemonde.fr\/idees\/article\/2021\/03\/08\/si-les-pays-asiatiques-ont-fait-preuve-d-efficacite-face-a-la-pandemie-la-phase-de-la-vaccination-s-annonce-plus-compliquee_6072289_3232.html\" target=\"_blank\">confront\u00e9s \u00e0 une m\u00e9fiance<\/a> de leur population vis-\u00e0-vis du vaccin&nbsp;!<\/p>\n\n\n\n<p>Quelle proportion de la population doit \u00eatre immunis\u00e9e pour atteindre une immunit\u00e9 collective et est-on proche de cette proportion en France&nbsp;? Pour r\u00e9pondre \u00e0 cette question essentielle, il faut consid\u00e9rer que la proportion d\u00e9pend de la capacit\u00e9 de contagion du virus, R0, comme la Gazette <a rel=\"noreferrer noopener\" href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/04\/24\/immunite-collective\/\" target=\"_blank\">l\u2019a d\u00e9j\u00e0 expliqu\u00e9.<\/a> Il y a un an, la Covid 19 avait un coefficient de reproduction R estim\u00e9 \u00e0 3 ou 3,3, ce qui amenait \u00e0 67 ou 70 % le taux d\u2019immunit\u00e9 minimal pour une immunit\u00e9 collective. Puis nous avons eu le variant anglais, plus contagieux (R=5) et on <a rel=\"noreferrer noopener\" href=\"https:\/\/www.lemonde.fr\/international\/article\/2021\/06\/06\/le-variant-delta-40-plus-transmissible-que-le-variant-alpha-selon-les-autorites-britanniques_6083087_3210.html\" target=\"_blank\">annonce maintenant<\/a> que le variant indien serait 40 % plus contagieux que le variant anglais (R= 7&nbsp;?)&nbsp;! Les Anglais qui s\u2019appr\u00eataient \u00e0 lever les contraintes sanitaires voient aujourd\u2019hui l\u2019\u00e9pid\u00e9mie repartir (encore lentement, heureusement).<\/p>\n\n\n\n<p>Avec un R \u00e0 7, l\u2019immunit\u00e9 collective serait atteinte \u00e0 partir de 86 %. Aujourd\u2019hui, les Fran\u00e7ais de 70\/79 ans <a href=\"https:\/\/covidtracker.fr\/vaccintracker\/\" target=\"_blank\" rel=\"noreferrer noopener\">ont atteint<\/a> tout juste ce taux de vaccination (du moins pour la premi\u00e8re dose), mais ils sont les seuls. On notera qu\u2019il y a d\u2019autres personnes immunis\u00e9es, celles qui ont d\u00e9j\u00e0 attrap\u00e9 la maladie, mais ne sont pas vaccin\u00e9es, sans que l&rsquo;on connaisse leur nombre avec pr\u00e9cision.<\/p>\n\n\n\n<p>Fin mai, plusieurs m\u00e9dias se sont fait l\u2019\u00e9cho d\u2019inqui\u00e9tudes gouvernementales (par exemple <a href=\"https:\/\/www.lemonde.fr\/politique\/article\/2021\/05\/30\/covid-19-le-gouvernement-craint-un-plafond-de-verre-vaccinal_6082052_823448.html\" target=\"_blank\" rel=\"noreferrer noopener\">ici<\/a> ou <a href=\"https:\/\/www.la-croix.com\/Sciences-et-ethique\/EN-DIRECT-Vaccination-quel-objectif-poursuivre-dici-lautomne-2021-05-21-1201156975?utm_source=newsletter&amp;utm_medium=email&amp;utm_content=20210525&amp;utm_campaign=NEWSLETTER__CRX_SCIENCE_ETHIQUE_EDITO&amp;PMID=5cf4391ef9dbc0367750202561279a29&amp;_ope=eyJndWlkIjoiNWNmNDM5MWVmOWRiYzAzNjc3NTAyMDI1NjEyNzlhMjkifQ==\" target=\"_blank\" rel=\"noreferrer noopener\">ici<\/a>)&nbsp;:&nbsp; on approchait du moment o\u00f9 toutes les personnes volontaires pour la vaccination et dans les \u00e2ges vis\u00e9s auraient \u00e9t\u00e9 vaccin\u00e9es. On risque donc de se retrouver d\u2019ici quelques semaines avec des doses disponibles, un taux de vaccination insuffisant pour atteindre l\u2019immunit\u00e9 collective et des non-vaccin\u00e9s ne voulant pas recevoir d\u2019injection.<\/p>\n\n\n\n<p>Pour continuer \u00e0 faire progresser le taux de vaccination, il y a deux solutions, mises en \u0153uvre toutes les deux.<\/p>\n\n\n\n<p>D\u2019abord convaincre les h\u00e9sitants. Les enqu\u00eates montrent qu\u2019il y a des Fran\u00e7ais qui refusent de se faire vacciner et d\u2019autres qui sont seulement r\u00e9ticents, et que la proportion de ces deux cat\u00e9gories <a href=\"https:\/\/www.la-croix.com\/Sciences-et-ethique\/Covid-19-Francais-sont-ils-devenus-pro-vaccins-2021-05-31-1201158465?utm_source=newsletter&amp;utm_medium=email&amp;utm_content=20210531&amp;utm_campaign=NEWSLETTER__CRX_JOUR_EDITO&amp;_ope=eyJndWlkIjoiNWNmNDM5MWVmOWRiYzAzNjc3NTAyMDI1NjEyNzlhMjkifQ==\" target=\"_blank\" rel=\"noreferrer noopener\">a baiss\u00e9 depuis janvier<\/a>. &nbsp;Il y a donc une action \u00e0 mener pour convaincre les r\u00e9ticents, mais aussi pour <a href=\"https:\/\/www.lemonde.fr\/planete\/article\/2021\/06\/01\/moi-je-ne-risque-pas-grand-chose-je-ne-vois-personne-comment-convaincre-les-plus-reticents-de-se-faire-vacciner_6082296_3244.html\" target=\"_blank\" rel=\"noreferrer noopener\">aller chercher<\/a> ceux qui ont des difficult\u00e9s \u00e0 acc\u00e9der aux vaccins, parce qu\u2019ils sont isol\u00e9s ou parce qu\u2019ils h\u00e9sitent \u00e0 se servir d\u2019Internet. Il y en a certainement parmi les plus de 80 ans, dont le taux de vaccination est plus faible que celui des 70\/79 ans.<\/p>\n\n\n\n<p>Ensuite, \u00e9largir les populations vaccinables. C\u2019est-\u00e0-dire en pratique, <a href=\"https:\/\/www.lemonde.fr\/planete\/article\/2021\/06\/03\/covid-19-aux-etats-unis-3-millions-de-jeunes-adolescents-vaccines-en-moins-de-trois-semaines-afin-qu-ils-protegent-les-autres_6082599_3244.html\" target=\"_blank\" rel=\"noreferrer noopener\">baisser la limite d\u2019\u00e2ge actuellement \u00e0 18 ans<\/a>. On peut se demander pourquoi vacciner des enfants. Mais chacun sait que d\u2019habitude ce sont g\u00e9n\u00e9ralement les enfants qu\u2019on vaccine, comme contre la polio ou la tuberculose. Donc la vraie question est de savoir pourquoi on n\u2019a pas vaccin\u00e9 les enfants et les ados jusqu\u2019\u00e0 pr\u00e9sent&nbsp;!<\/p>\n\n\n\n<p>La premi\u00e8re raison est simple&nbsp;: ils n\u2019\u00e9taient pas ou peu touch\u00e9s au d\u00e9but de la pand\u00e9mie, au moment o\u00f9 le vaccin a \u00e9t\u00e9 mis au point. On ne savait m\u00eame pas si les enfants \u00e9taient contaminants. Ils n\u2019\u00e9taient donc pas prioritaires, mais surtout, il \u00e9tait plus difficile de tester le vaccin chez eux. Impossible de disposer d\u2019un groupe contr\u00f4le facile \u00e0 suivre: comment savoir si des gens asymptomatiques sont contamin\u00e9s! Dans un premier temps, on a donc fait les essais de vaccins (phase 2 puis 3) sur des adultes de 18 \u00e0 65 ans, en excluant les plus fragiles (femmes enceintes, immunod\u00e9prim\u00e9s, etc.). Le rythme de contamination \u00e9tait tel dans la population qu\u2019on a pu rapidement voir la diff\u00e9rence de nombre d\u2019hospitalis\u00e9s entre les vaccin\u00e9s et le groupe t\u00e9moin. Mais on a aussi vite pu identifier les quelques effets secondaires. Ce qui a permis dans un deuxi\u00e8me temps d\u2019\u00e9largir la population pour laquelle il a \u00e9t\u00e9 fait des essais de phase 2 et 3&nbsp;: les plus de 65 ans, les femmes enceintes\u2026<\/p>\n\n\n\n<p>Avec le variant anglais, les jeunes ont commenc\u00e9 \u00e0 \u00eatre plus s\u00e9rieusement touch\u00e9s (et contaminants). On a alors pu faire des essais sur les populations plus jeunes&nbsp;: les 16\/17 ans d\u2019abord et les 12\/15 ans ensuite. Il est donc tout \u00e0 fait logique de proposer de les vacciner aujourd\u2019hui, pour les prot\u00e9ger d\u2019abord, pour \u00e9viter qu\u2019ils contaminent leurs parents et grands-parents ensuite.<\/p>\n\n\n\n<p>Nous voyons l&rsquo;horizon s&rsquo;\u00e9claircir, tant mieux. Mais il y a encore quelques pas \u00e0 faire !<\/p>\n","protected":false},"excerpt":{"rendered":"<p>D\u00e9but juin, plus de la moiti\u00e9 des adultes fran\u00e7ais avaient re\u00e7u au moins une dose d\u2019un vaccin contre le COVID 19. La campagne se poursuivait \u00e0 bon train, avec plus de 700&nbsp;000 injections certains jours. Maintenant que les livraisons de vaccins se succ\u00e8dent \u00e0 un rythme soutenu, certains s\u2019inqui\u00e8tent \u00e0&#8230;<\/p>\n","protected":false},"author":11,"featured_media":4205,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[53],"tags":[],"class_list":["post-4195","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analyses","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Vaccination : quel objectif maintenant ? - La Gazette<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/06\/09\/vaccination-quel-objectif-maintenant\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vaccination : quel objectif maintenant ? - La Gazette\" \/>\n<meta property=\"og:description\" content=\"D\u00e9but juin, plus de la moiti\u00e9 des adultes fran\u00e7ais avaient re\u00e7u au moins une dose d\u2019un vaccin contre le COVID 19. La campagne se poursuivait \u00e0 bon train, avec plus de 700&nbsp;000 injections certains jours. Maintenant que les livraisons de vaccins se succ\u00e8dent \u00e0 un rythme soutenu, certains s\u2019inqui\u00e8tent \u00e0&#8230;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/06\/09\/vaccination-quel-objectif-maintenant\/\" \/>\n<meta property=\"og:site_name\" content=\"La Gazette\" \/>\n<meta property=\"article:published_time\" content=\"2021-06-09T07:44:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-06-09T08:46:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/06\/seringue-images-et-photos-gratuites-libres-de-droits-t\u00e9l\u00e9chargement-gratuits181-1560x1170-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1560\" \/>\n\t<meta property=\"og:image:height\" content=\"1170\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"G\u00e9rard Bardier\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"G\u00e9rard Bardier\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/06\/09\/vaccination-quel-objectif-maintenant\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/06\/09\/vaccination-quel-objectif-maintenant\/\"},\"author\":{\"name\":\"G\u00e9rard Bardier\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/#\/schema\/person\/5650e206a121f68c6f5e76379bccfbc4\"},\"headline\":\"Vaccination : quel objectif maintenant ?\",\"datePublished\":\"2021-06-09T07:44:37+00:00\",\"dateModified\":\"2021-06-09T08:46:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/06\/09\/vaccination-quel-objectif-maintenant\/\"},\"wordCount\":935,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/#organization\"},\"image\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/06\/09\/vaccination-quel-objectif-maintenant\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/06\/seringue-images-et-photos-gratuites-libres-de-droits-t\u00e9l\u00e9chargement-gratuits181-1560x1170-1.jpg\",\"articleSection\":[\"Analyses\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/06\/09\/vaccination-quel-objectif-maintenant\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/06\/09\/vaccination-quel-objectif-maintenant\/\",\"url\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/06\/09\/vaccination-quel-objectif-maintenant\/\",\"name\":\"Vaccination : quel objectif maintenant ? 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