{"id":16529,"date":"2021-12-25T14:22:26","date_gmt":"2021-12-25T14:22:26","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron"},"modified":"2021-12-25T14:54:01","modified_gmt":"2021-12-25T14:54:01","slug":"ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron","title":{"rendered":"Ce que les \u00e9tudes disent sur l\u2019efficacit\u00e9 du rappel vaccinal contre l\u2019Omicron"},"content":{"rendered":"

Africa-Press – Tchad. <\/strong><\/span>Le sch\u00e9ma vaccinal complet ne permet pas de se prot\u00e9ger contre l\u2019Omicron, r\u00e9v\u00e8lent des \u00e9tudes men\u00e9es par divers instituts britanniques. Cependant, le rappel vaccinal semble augmenter l\u2019efficacit\u00e9 jusqu\u2019\u00e0 70-80%, avant une diminution au bout de la dixi\u00e8me semaine apr\u00e8s l\u2019injection.<\/p>\n

Hautement contagieux, le variant Omicron arrive \u00e0 d\u00e9passer l\u2019immunit\u00e9 apr\u00e8s un sch\u00e9ma vaccinal complet. La troisi\u00e8me dose semble augmenter le niveau de protection, mais sa durabilit\u00e9 laisse planer des doutes, selon de r\u00e9centes \u00e9tudes britanniques.<\/p>\n

Six mois apr\u00e8s la deuxi\u00e8me injection, les vaccins de Pfizer, AstraZeneca et Moderna ne prot\u00e8gent plus contre les formes symptomatiques suscit\u00e9es par l\u2019Omicron, \u00e0 en juger par les donn\u00e9es relay\u00e9es dans un rapport de l\u2019agence sanitaire UKHSA (UK Health Security Agency), publi\u00e9 le 23 d\u00e9cembre. L’\u00e9tude comprend 147.597 cas de Delta et 68.489 cas d\u2019Omicron. Pour les trois vaccins, l\u2019efficacit\u00e9 \u00e9tait autour de z\u00e9ro.<\/p>\n

En cas de vaccination avec Pfizer, la troisi\u00e8me dose remonte son efficacit\u00e9 \u00e0 70%, laquelle a tendance \u00e0 diminuer un mois apr\u00e8s l\u2019injection jusqu\u2019\u00e0 45% au bout de la dixi\u00e8me semaine apr\u00e8s le rappel. Deux doses d\u2019AstraZeneca et un rappel de Pfizer augmentent aussit\u00f4t la protection jusqu\u2019\u00e0 pr\u00e8s de 50% avant de chuter jusqu\u2019\u00e0 35% vers la dixi\u00e8me semaine.<\/p>\n

Le risque d’hospitalisation appara\u00eet r\u00e9duit par rapport au variant Delta, poursuivent les chercheurs. Selon les donn\u00e9es disponibles au 20 d\u00e9cembre, parmi ces personnes infect\u00e9es par l\u2019Omicron et comptabilis\u00e9es, 132 d\u2019entre elles ont \u00e9t\u00e9 admises ou transf\u00e9r\u00e9es aux services d’urgence.. Parmi celles-ci, 17 (12,9%) avaient re\u00e7u une dose de rappel, 74 (56,1%) une deuxi\u00e8me dose et 27 (20,5%) n’ont pas \u00e9t\u00e9 vaccin\u00e9es.<\/p>\n

Pour l\u2019heure, ces donn\u00e9es sont insuffisantes pour analyser l’efficacit\u00e9 du vaccin contre l’hospitalisation: Les chercheurs de l\u2019Imperial College de Londres ont abouti \u00e0 des conclusions relativement similaires. Avec les donn\u00e9es des cas positifs au coronavirus d\u00e9tect\u00e9s entre le 29 novembre et le 11 d\u00e9cembre 2021, ils ont r\u00e9v\u00e9l\u00e9 un risque significativement accru de contracter cette nouvelle souche en d\u00e9pit de l\u2019immunisation.<\/p>\n

L\u2019efficacit\u00e9 des vaccins contre l’infection symptomatique \u00e0 l\u2019Omicron a \u00e9t\u00e9 estim\u00e9e entre 0% et 20% apr\u00e8s deux doses, et entre 55% et 80% apr\u00e8s une dose de rappel.<\/p>\n

Par ailleurs, les chercheurs ont \u00e9galement observ\u00e9 une r\u00e9duction de 20 \u00e0 25% dans tout type d’hospitalisation pour l\u2019Omicron en comparaison avec le Delta.<\/p>\n

Une \u00e9tude r\u00e9alis\u00e9e par l\u2019universit\u00e9 d\u2019\u00c9dimbourg et publi\u00e9e le 22 d\u00e9cembre sugg\u00e8re elle aussi une diminution du risque d\u2019hospitalisation, quoique ses estimations divergent des pr\u00e9c\u00e9dentes:<\/p>\n

Dans une interview accord\u00e9e au Monde et publi\u00e9e le 19 d\u00e9cembre, le PDG de BioNTech Ugur Sahin a estim\u00e9 que m\u00eame les triples vaccin\u00e9s pouvaient transmettre le virus. Afin de contrer la menace, il a recommand\u00e9 de tester massivement et de respecter les mesures de protection, alors que le variant Omicron devient dominant.<\/p>\n

Le 24 d\u00e9cembre, la France a annonc\u00e9 un nouveau record de contaminations (94.124) recens\u00e9es en 24h. Au moins 113 personnes suppl\u00e9mentaires ont \u00e9t\u00e9 hospitalis\u00e9es, dont 46 en r\u00e9animation. 167 sont d\u00e9c\u00e9d\u00e9es. Au total, 16.173 personnes sont actuellement hospitalis\u00e9es pour cause de Covid-19 et 3.254 en soins intensifs.<\/p>\n

La Haute Autorit\u00e9 de Sant\u00e9 (HAS) recommande dans un avis publi\u00e9 le 24 d\u00e9cembre de r\u00e9duire \u00e0 trois mois le d\u00e9lai entre la primovaccination contre le Covid-19 et le rappel. De plus, elle prescrit d’\u00e9largir la campagne de rappel aux adolescents fragiles, afin de tenter de freiner la propagation du variant Omicron.<\/p>\n

Pour plus d’informations et d’analyses sur la Tchad<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Tchad. Le sch\u00e9ma vaccinal complet ne permet pas de se prot\u00e9ger contre l\u2019Omicron, r\u00e9v\u00e8lent des \u00e9tudes men\u00e9es par divers instituts britanniques. Cependant, le rappel vaccinal semble augmenter l\u2019efficacit\u00e9 jusqu\u2019\u00e0 70-80%, avant une diminution au bout de la dixi\u00e8me semaine apr\u00e8s l\u2019injection. Hautement contagieux, le variant Omicron arrive \u00e0 d\u00e9passer l\u2019immunit\u00e9 apr\u00e8s un sch\u00e9ma […]<\/p>\n","protected":false},"author":82,"featured_media":16528,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[37,292,2862,29],"class_list":["post-16529","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-tchad","tag-omicron","tag-tchad"],"yoast_head":"\nCe que les \u00e9tudes disent sur l\u2019efficacit\u00e9 du rappel vaccinal contre l\u2019Omicron - tchad<\/title>\n<meta name=\"description\" content=\"Le sch\u00e9ma vaccinal complet ne permet pas de se prot\u00e9ger contre l\u2019Omicron, r\u00e9v\u00e8lent des \u00e9tudes men\u00e9es par divers institut ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ce que les \u00e9tudes disent sur l\u2019efficacit\u00e9 du rappel vaccinal contre l\u2019Omicron\" \/>\n<meta property=\"og:description\" content=\"Le sch\u00e9ma vaccinal complet ne permet pas de se prot\u00e9ger contre l\u2019Omicron, r\u00e9v\u00e8lent des \u00e9tudes men\u00e9es par divers institut ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron\" \/>\n<meta property=\"og:site_name\" content=\"tchad\" \/>\n<meta property=\"article:published_time\" content=\"2021-12-25T14:22:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-12-25T14:54:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2021\/12\/img-61c730693bde3.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Ce que les \u00e9tudes disent sur l\u2019efficacit\u00e9 du rappel vaccinal contre l\u2019Omicron\",\"datePublished\":\"2021-12-25T14:22:26+00:00\",\"dateModified\":\"2021-12-25T14:54:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron\"},\"wordCount\":640,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2021\/12\/img-61c730693bde3.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Tchad\",\"Omicron\",\"Tchad\"],\"articleSection\":[\"Divers\",\"homepage-french\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron\",\"url\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/ce-que-les-etudes-disent-sur-lefficacite-du-rappel-vaccinal-contre-lomicron\",\"name\":\"Ce que les \u00e9tudes disent sur l\u2019efficacit\u00e9 du rappel vaccinal contre l\u2019Omicron - 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