Une \u00e9tude de l\u2019Acad\u00e9mie chinoise des sciences sugg\u00e8re que le variant Omicron du Covid-19 se serait d\u00e9velopp\u00e9 en 2020 chez certains animaux, notamment les souris, avant d\u2019\u00eatre retransmise \u00e0 l\u2019homme.<\/p>\n\n\n\n
Plus contagieux, mais paraissant moins virulent que ses pr\u00e9d\u00e9cesseurs selon les r\u00e9centes \u00e9tudes scientifiques, le variant Omicron du Covid-19 intrigue tant il s\u2019est propag\u00e9 \u00e0 la vitesse de l\u2019\u00e9clair. Si le premier cas chez l\u2019homme a \u00e9t\u00e9 d\u00e9tect\u00e9 en Afrique du Sud \u00e0 la fin du mois de novembre 2021, cette mutation du virus se serait en fait cach\u00e9e durant des mois.<\/p>\n\n\n\n
Une premi\u00e8re piste \u00e9voquait qu\u2019Omicron proviendrait d\u2019une jeune femme immunod\u00e9prim\u00e9e, comme le rapporte cet article de Science. Mais cette hypoth\u00e8se ne fait pas l\u2019unanimit\u00e9 chez les chercheurs.<\/p>\n\n\n\n
Le virus a mut\u00e9 durant plus d\u2019un an chez les souris ?<\/strong><\/p>\n\n\n\n R\u00e9cemment, une autre possibilit\u00e9 a \u00e9t\u00e9 mise sur la table, apr\u00e8s une \u00e9tude r\u00e9v\u00e9l\u00e9e par l\u2019Institut de g\u00e9n\u00e9tique et de biologie du d\u00e9veloppement, l\u2019Acad\u00e9mie chinoise des sciences et la Soci\u00e9t\u00e9 de g\u00e9n\u00e9tique de Chine, rapport\u00e9e par nos confr\u00e8res de La D\u00e9p\u00eache . Celle-ci sugg\u00e8re qu\u2019Omicron aurait pu se d\u00e9velopper chez les animaux, et plus exactement chez les souris.<\/p>\n\n\n\n Le coronavirus aurait circul\u00e9 pendant plus d\u2019un an chez les souris, contamin\u00e9es par l\u2019homme, avant d\u2019\u00eatre de nouveau transmise \u00e0 l\u2019\u00eatre humain sous une autre forme. \u00ab Nous avons sugg\u00e9r\u00e9 une trajectoire dans laquelle l\u2019anc\u00eatre d\u2019Omicron a connu un \u00e9v\u00e9nement zoonotique inverse des humains aux souris au cours de la pand\u00e9mie (tr\u00e8s probablement mi-2020) et a accumul\u00e9 des mutations chez une souris h\u00f4te pendant plus d\u2019un an avant de revenir \u00e0 l\u2019homme \u00e0 la fin de 2021 \u00bb, indique l\u2019\u00e9tude.<\/p>\n","protected":false},"excerpt":{"rendered":" Une \u00e9tude de l\u2019Acad\u00e9mie chinoise des sciences sugg\u00e8re que le variant Omicron du Covid-19 se serait d\u00e9velopp\u00e9 en 2020 chez certains animaux, notamment les souris, avant d\u2019\u00eatre retransmise \u00e0 l\u2019homme. Plus contagieux, mais paraissant moins virulent que ses pr\u00e9d\u00e9cesseurs selon les r\u00e9centes \u00e9tudes scientifiques, le variant Omicron du Covid-19 intrigue tant il s\u2019est propag\u00e9 \u00e0 […]<\/p>\n","protected":false},"author":4,"featured_media":34929,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","jnews-multi-image_gallery":[],"jnews_single_post":{"subtitle":"","format":"standard","video":"","gallery":"","source_name":"","source_url":"","via_name":"","via_url":"","override":[{"single_blog_custom":"","sidebar":"","second_sidebar":"","share_position":"","share_float_style":"","post_date_format":"","post_date_format_custom":"","post_reading_time_wpm":"","zoom_button_out_step":"1","zoom_button_in_step":"1","number_popup_post":"1"}],"image_override":[{"single_post_thumbnail_size":"","single_post_gallery_size":""}],"trending_post_position":"","trending_post_label":"","sponsored_post_label":"","sponsored_post_name":"","sponsored_post_url":"","sponsored_post_logo":"","sponsored_post_desc":""},"jnews_primary_category":{"id":""},"jnews_override_bookmark_settings":[],"jnews_review":[],"enable_review":"","type":"","name":"","summary":"","brand":"","sku":"","good":[],"bad":[],"score_override":"","override_value":"","rating":[],"price":[],"jnews_post_split":[],"footnotes":""},"categories":[11],"tags":[],"class_list":["post-36279","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-health"],"_links":{"self":[{"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=\/wp\/v2\/posts\/36279","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=36279"}],"version-history":[{"count":1,"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=\/wp\/v2\/posts\/36279\/revisions"}],"predecessor-version":[{"id":36280,"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=\/wp\/v2\/posts\/36279\/revisions\/36280"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=\/wp\/v2\/media\/34929"}],"wp:attachment":[{"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=36279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.africanchallenges.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}