{"id":7326,"date":"2026-06-11T10:14:03","date_gmt":"2026-06-11T07:14:03","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/immunite-collective\/"},"modified":"2026-07-23T14:04:37","modified_gmt":"2026-07-23T11:04:37","slug":"immunite-collective","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/fr\/glossaire\/immunite-collective\/","title":{"rendered":"Immunit\u00e9 collective"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">L&rsquo;immunit\u00e9 collective (du latin <em>collectivus<\/em> \u2014 coll\u00e9gial et <em>immunitas<\/em> \u2014 insensibilit\u00e9, lib\u00e9ration) est un concept \u00e9pid\u00e9miologique cl\u00e9. Elle d\u00e9crit une phase de protection de la population o\u00f9 la majorit\u00e9 des personnes poss\u00e8dent une immunit\u00e9 individuelle contre une infection. Cela rend sa propagation massive future impossible.<\/p>\n\n<h2 id=\"h-&#x44D;&#x442;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;-&#x438;-&#x43F;&#x430;&#x442;&#x43E;&#x444;&#x438;&#x437;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;\" class=\"wp-block-heading\"><strong>\u00c9tiologie et physiopathologie<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">Pour leur survie, les virus et les bact\u00e9ries n\u00e9cessitent une cha\u00eene de transmission ininterrompue d&rsquo;une personne infect\u00e9e \u00e0 une personne vuln\u00e9rable. Le degr\u00e9 de contagiosit\u00e9 d&rsquo;un pathog\u00e8ne est mesur\u00e9 par le nombre de reproduction de base (R0) \u2014 le nombre de personnes qu&rsquo;un malade contamine en moyenne dans un environnement d\u00e9nu\u00e9 d&rsquo;immunit\u00e9.<\/p>\n\n<p class=\"wp-block-paragraph\">Si une personne de la cha\u00eene est vaccin\u00e9e ou poss\u00e8de des anticorps apr\u00e8s avoir surmont\u00e9 la maladie, elle devient une \u00ab impasse biologique \u00bb pour le pathog\u00e8ne. Le virus p\u00e9n\u00e8tre dans son organisme, mais il est imm\u00e9diatement d\u00e9truit par le syst\u00e8me immunitaire et n&rsquo;est pas \u00e9limin\u00e9 dans l&rsquo;environnement.<\/p>\n\n<p class=\"wp-block-paragraph\">Lorsque le nombre de personnes ainsi prot\u00e9g\u00e9es atteint un seuil critique, le pathog\u00e8ne ne peut plus se transmettre de personne \u00e0 personne, et la maladie ne se manifeste pas dans la soci\u00e9t\u00e9 ou le collectif :<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>pour la rougeole hautement contagieuse<\/strong> \u2014 le seuil est de 95 % ;<\/li>\n\n\n\n<li><strong>pour la poliomy\u00e9lite<\/strong> \u2014 environ 80 %.<\/li>\n<\/ul>\n\n<h2 id=\"h-&#x43A;&#x43B;&#x438;&#x43D;&#x438;&#x447;&#x435;&#x441;&#x43A;&#x43E;&#x435;-&#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;\" class=\"wp-block-heading\"><strong>Importance clinique<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">La formation de l&rsquo;immunit\u00e9 collective par la vaccination de masse est le seul outil m\u00e9dical pour \u00e9radiquer mondialement des maladies (comme c&rsquo;est ainsi que l&rsquo;humanit\u00e9 a compl\u00e8tement \u00e9limin\u00e9 la variole).<\/p>\n\n<p class=\"wp-block-paragraph\">D&rsquo;un point de vue clinique, ce m\u00e9canisme joue le r\u00f4le de \u00ab bouclier social \u00bb. Il est essentiel pour prot\u00e9ger les patients pour qui la vaccination est m\u00e9dicalement contre-indiqu\u00e9e.<\/p>\n\n<p class=\"wp-block-paragraph\">Ces cat\u00e9gories vuln\u00e9rables incluent :<\/p>\n\n<ul class=\"wp-block-list\">\n<li>les nouveau-n\u00e9s ;<\/li>\n\n\n\n<li>les femmes enceintes ;<\/li>\n\n\n\n<li>les receveurs d&rsquo;organes ou de moelle osseuse ;<\/li>\n\n\n\n<li>les patients atteints du VIH ou recevant une chimioth\u00e9rapie intensive.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;immunit\u00e9 collective (du latin <em>collectivus<\/em> \u2014 coll\u00e9gial et <em>immunitas<\/em> \u2014 insensibilit\u00e9, lib\u00e9ration) est un concept \u00e9pid\u00e9miologique cl\u00e9. Elle d\u00e9crit une phase de protection de la population o\u00f9 la majorit\u00e9 des personnes poss\u00e8dent une immunit\u00e9 individuelle contre une infection. Cela rend sa propagation massive future impossible.<\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-7326","glossary_item","type-glossary_item","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Immunit\u00e9 collective : d\u00e9finition m\u00e9dicale et description | Voka Wiki<\/title>\n<meta name=\"description\" content=\"L&#039;immunit\u00e9 collective (du latin collectivus \u2014 coll\u00e9gial et immunitas \u2014 insensibilit\u00e9, lib\u00e9ration) est un concept \u00e9pid\u00e9miologique cl\u00e9. Elle d\u00e9crit une phase de protection de la population o\u00f9 la majorit\u00e9 des personnes poss\u00e8dent une immunit\u00e9 individuelle contre une infection. Cela rend sa propagation massive future impossible.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/wiki.voka.io\/fr\/glossaire\/immunite-collective\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Immunit\u00e9 collective\" \/>\n<meta property=\"og:description\" content=\"L&#039;immunit\u00e9 collective (du latin collectivus \u2014 coll\u00e9gial et immunitas \u2014 insensibilit\u00e9, lib\u00e9ration) est un concept \u00e9pid\u00e9miologique cl\u00e9. Elle d\u00e9crit une phase de protection de la population o\u00f9 la majorit\u00e9 des personnes poss\u00e8dent une immunit\u00e9 individuelle contre une infection. 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