{"id":6637,"date":"2025-05-20T02:56:01","date_gmt":"2025-05-20T00:56:01","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/lanalyse-genomique-montre-une-transmission-mpox-generalisee-en-afrique-de-louest-avant-2022-epidemie-mondiale\/"},"modified":"2025-05-20T02:56:02","modified_gmt":"2025-05-20T00:56:02","slug":"lanalyse-genomique-montre-une-transmission-mpox-generalisee-en-afrique-de-louest-avant-2022-epidemie-mondiale","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/lanalyse-genomique-montre-une-transmission-mpox-generalisee-en-afrique-de-louest-avant-2022-epidemie-mondiale\/","title":{"rendered":"L&rsquo;analyse g\u00e9nomique montre une transmission MPOX g\u00e9n\u00e9ralis\u00e9e en Afrique de l&rsquo;Ouest avant 2022 \u00c9pid\u00e9mie mondiale"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/genomic-data-shows-wid.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/2025\/genomic-data-shows-wid.jpg\" data-sub-html=\"Participants from the Pan-African mpox consortium collaborated to produce and analyze mpox genomic data from West and Central Africa, resulting in a dataset that is around three times larger than any previous mpox dataset. Credit: Fikayo Oyewale\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Historiquement, la plupart des infections \u00e0 MPOX humaines ont r\u00e9sult\u00e9 de la transmission zoonotique &#8211; provenant d&rsquo;animaux aux humains &#8211; et ces retomb\u00e9es ont rarement conduit \u00e0 la transmission humaine \u00e0 l&rsquo;humain. Mais pendant l&rsquo;\u00e9pid\u00e9mie mondiale de 2022, MPOX a commenc\u00e9 \u00e0 se propager facilement entre les gens. Une nouvelle \u00e9tude montre maintenant que le virus circulait bien avant.<\/p>\n<p>Publi\u00e9 dans <i>Nature<\/i> on May 19, 2025, the study notes that mpox was being transmitted among humans in Nigeria for eight years before sparking the international outbreak in 2022. Using genomic tracing, the researchers estimate that the virus&rsquo;s ancestor first emerged in southern Nigeria in August 2014 and spread to 11 states before human infections were detected in 2017. The findings highlight the need for improved global surveillance and medicines, given the threat of impending pand\u00e9mies.<\/p>\n<p>\u00ab\u00a0Nous aurions pu emp\u00eacher tr\u00e8s facilement l&rsquo;\u00e9pid\u00e9mie de plusieurs pays en 2022 si les pays d&rsquo;Afrique avaient un meilleur acc\u00e8s aux th\u00e9rapies, aux vaccins et aux technologies de surveillance\u00a0\u00bb, explique Ethy Parker, collaborateur professionnel dans le laboratoire Kristian Andersen chez Scripps Research et l&rsquo;un des premiers auteurs de l&rsquo;article. \u00ab\u00a0Dans un monde vuln\u00e9rablement connect\u00e9, nous ne pouvons pas n\u00e9gliger les \u00e9pid\u00e9mies jusqu&rsquo;\u00e0 ce qu&rsquo;ils soient export\u00e9s vers le Nord mondial.\u00a0\u00bb<\/p>\n<p>Parce que le virus impliqu\u00e9 dans l&rsquo;\u00e9pid\u00e9mie de 2022 avait un nombre inattendu de mutations g\u00e9n\u00e9tiques, les scientifiques pensaient que MPOX pourrait circuler au Nig\u00e9ria depuis bien plus longtemps que pr\u00e9vu. Cependant, en raison d&rsquo;un manque de donn\u00e9es g\u00e9nomiques, il n&rsquo;\u00e9tait pas clair quand et o\u00f9 le virus avait d&rsquo;abord \u00e9merg\u00e9, et ce qui avait motiv\u00e9 son \u00e9mergence.<\/p>\n<p>Pour r\u00e9soudre ce probl\u00e8me, l&rsquo;auteur principal de l&rsquo;\u00e9tude, Christian Happi, directeur de l&rsquo;Institut de g\u00e9nomique et de la sant\u00e9 mondiale de l&rsquo;Universit\u00e9 Redeemer au Nig\u00e9ria, a organis\u00e9 un consortium panafricain pour partager et g\u00e9n\u00e9rer des donn\u00e9es g\u00e9nomiques MPOX. Le consortium a impliqu\u00e9 des chercheurs et des agences de sant\u00e9 publique en Afrique occidentale et centrale, avec le soutien de collaborateurs internationaux, notamment Scripps Research. En regroupant des \u00e9chantillons et des m\u00e9thodes de laboratoire, le groupe a g\u00e9n\u00e9r\u00e9 un ensemble de donn\u00e9es g\u00e9nomique qui est environ trois fois plus grand que n&rsquo;importe quel jeu de donn\u00e9es MPOX pr\u00e9c\u00e9dent.<\/p>\n<p>Au total, l&rsquo;\u00e9quipe a analys\u00e9 118 g\u00e9nomes viraux des cas de MPOX humains qui se sont produits au Nig\u00e9ria et au Cameroun entre 2018 et 2023. Toutes les s\u00e9quences ont \u00e9t\u00e9 identifi\u00e9es comme clade IIB &#8211; la souche MPOX end\u00e9mique en Afrique de l&rsquo;Ouest. En comparant les s\u00e9quences des g\u00e9nomes, les chercheurs ont cr\u00e9\u00e9 quelque chose appel\u00e9 un arbre phylog\u00e9n\u00e9tique, qui estime \u00e0 quel point les diff\u00e9rents virus sont li\u00e9s et \u00e0 quel point ils ont \u00e9volu\u00e9 r\u00e9cemment.<\/p>\n<p>Ils ont constat\u00e9 que la plupart des \u00e9chantillons viraux du Nig\u00e9ria \u00e9taient le r\u00e9sultat de la transmission humaine \u00e0 l&rsquo;human (105\/109), tandis que les quatre autres \u00e9taient caus\u00e9s par des retomb\u00e9es zoonotiques. En revanche, les neuf \u00e9chantillons de MPOX du Cameroun ont \u00e9t\u00e9 d\u00e9riv\u00e9s d&rsquo;\u00e9v\u00e9nements isol\u00e9s de retomb\u00e9es zoonotiques.<\/p>\n<p>\u00ab\u00a0MPOX n&rsquo;est plus seulement un virus zoonotique au Nig\u00e9ria; c&rsquo;est vraiment un virus humain\u00a0\u00bb, explique Parker. \u00ab\u00a0Mais le fait qu&rsquo;il y ait une transmission zoonotique continue signifie qu&rsquo;il existe \u00e9galement un risque continu de r\u00e9\u00e9mergence.\u00a0\u00bb<\/p>\n<p>En utilisant l&rsquo;arbre phylog\u00e9n\u00e9tique, l&rsquo;\u00e9quipe a estim\u00e9 que l&rsquo;anc\u00eatre du virus MPOX transmettant l&rsquo;homme est apparu chez les animaux en novembre 2013 et est entr\u00e9 pour la premi\u00e8re fois dans la population humaine dans le sud du Nig\u00e9ria en ao\u00fbt 2014. Ils ont \u00e9galement montr\u00e9 que le sud du Nig\u00e9ria \u00e9tait la principale source de cas de transmission humaine qui se produisait dans le sud du pays.<\/p>\n<p>L&rsquo;\u00e9quipe a \u00e9galement montr\u00e9 que deux des \u00e9chantillons viraux transmis par zoonotiquement du sud du Nig\u00e9ria \u00e9taient li\u00e9s aux virus camerounais, sugg\u00e9rant que les virus traversent la fronti\u00e8re.<\/p>\n<p>\u00ab\u00a0Il y a probablement beaucoup plus de mouvements viraux bidirectionnels entre ces pays, mais nous n&rsquo;avons tout simplement pas l&rsquo;\u00e9chantillonnage de la faune pour le d\u00e9tecter\u00a0\u00bb, explique Parker. \u00ab\u00a0Notre \u00e9tude met en \u00e9vidence la n\u00e9cessit\u00e9 d&rsquo;une meilleure surveillance de la faune, ainsi qu&rsquo;une meilleure surveillance dans les populations humaines qui s&rsquo;interfacent avec les animaux dans cette r\u00e9gion frontali\u00e8re bois\u00e9e.\u00a0\u00bb<\/p>\n<p>Dans l&rsquo;ensemble, l&rsquo;\u00e9tude montre l&rsquo;importance d&rsquo;un meilleur acc\u00e8s aux diagnostics, aux vaccins et aux th\u00e9rapies en Afrique, selon les chercheurs.<\/p>\n<p>\u00ab\u00a0Les in\u00e9galit\u00e9s mondiales de la sant\u00e9 entravent vraiment notre capacit\u00e9 \u00e0 contr\u00f4ler la transmission humaine zoonotique et soutenue\u00a0\u00bb, explique Parker. \u00ab\u00a0Nous ne pouvons pas continuer \u00e0 n\u00e9gliger soit les \u00e9pid\u00e9mies humaines en Afrique, soit le risque de r\u00e9\u00e9mergence &#8211; il ne fait pas seulement perp\u00e9tuer la souffrance dans ces r\u00e9gions, cela signifie qu&rsquo;il y aura in\u00e9vitablement une autre pand\u00e9mie.\u00a0\u00bb<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Historiquement, la plupart des infections \u00e0 MPOX humaines ont r\u00e9sult\u00e9 de la transmission zoonotique &#8211;<\/p>\n","protected":false},"author":1,"featured_media":6638,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[306,37,936,5372,1331,1730,4169,1994,210,324,476,47],"class_list":["post-6637","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-afrique","tag-avant","tag-epidemie","tag-generalisee","tag-genomique","tag-lanalyse","tag-louest","tag-mondiale","tag-montre","tag-mpox","tag-transmission","tag-une","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - 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Depuis plus de dix ans, j'explore et rapporte les histoires poignantes des individus confront\u00e9s \u00e0 ces d\u00e9fis, tout en sensibilisant le public aux traitements novateurs et aux progr\u00e8s scientifiques dans ce domaine. 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