{"id":2784,"date":"2025-11-28T08:08:25","date_gmt":"2025-11-28T08:08:25","guid":{"rendered":"https:\/\/innotub.eu\/?p=2784"},"modified":"2025-11-28T08:20:31","modified_gmt":"2025-11-28T08:20:31","slug":"l-infection-residuelle-un-facteur-cle-dans-la-persistance-de-la-tuberculose-bovine","status":"publish","type":"post","link":"https:\/\/innotub.eu\/fr\/l-infection-residuelle-un-facteur-cle-dans-la-persistance-de-la-tuberculose-bovine\/","title":{"rendered":"L\u2019\u00abinfection r\u00e9siduelle\u00bb : un facteur cl\u00e9 dans la persistance de la tuberculose bovine"},"content":{"rendered":"\n<p>Une r\u00e9cente \u00e9tude de l\u2019IRTA-CReSA, r\u00e9alis\u00e9e en collaboration avec l\u2019Universit\u00e9 Autonome de Barcelone (UAB) et le D\u00e9partement de l\u2019Agriculture, de l\u2019\u00c9levage, de la P\u00eache et de l\u2019Alimentation (DARPA), a examin\u00e9 deux foyers r\u00e9currents de tuberculose bovine dans une m\u00eame zone de Catalogne, s\u00e9par\u00e9s par neuf ans : le premier entre 2009 et 2012 et le second entre 2021 et 2022. Au total, cinq troupeaux bovins et au moins deux sangliers ont \u00e9t\u00e9 touch\u00e9s, et tous les troupeaux ont d\u00fb \u00eatre enti\u00e8rement abattus \u2014 ce qu\u2019on appelle le vide sanitaire \u2014 \u00e0 un moment donn\u00e9 du processus d\u2019\u00e9radication.<\/p>\n\n<p>La tuberculose bovine, caus\u00e9e principalement par la bact\u00e9rie Mycobacterium bovis, est une maladie infectieuse chronique pouvant affecter aussi bien les animaux que l\u2019\u00eatre humain. En Catalogne, son incidence est tr\u00e8s faible et en 2023 la r\u00e9gion a obtenu le statut de \u00ab officiellement indemne de tuberculose bovine \u00bb. Cependant, des foyers sporadiques continuent d\u2019\u00eatre d\u00e9tect\u00e9s, pouvant \u00eatre li\u00e9s \u00e0 la persistance de la bact\u00e9rie au sein des troupeaux ou \u00e0 sa transmission depuis d\u2019autres esp\u00e8ces, comme le sanglier ou les caprins. Cette complexit\u00e9, impliquant plusieurs h\u00f4tes et une infection \u00e0 \u00e9volution lente, rend l\u2019\u00e9radication compl\u00e8te particuli\u00e8rement difficile.<\/p>\n\n<h3 class=\"wp-block-heading\">Un cas d\u2019infection \u201csilencieuse\u201d<\/h3>\n\n<p>Gr\u00e2ce au s\u00e9quen\u00e7age g\u00e9nomique complet des isolats de M. bovis et \u00e0 l\u2019analyse \u00e9pid\u00e9miologique des foyers, l\u2019\u00e9tude a identifi\u00e9 une infection r\u00e9siduelle de longue dur\u00e9e au sein d\u2019un troupeau bovin qui avait servi de pont entre les deux \u00e9pisodes et \u00e9galement de source de transmission au sanglier (avec une faible pr\u00e9valence, environ 2 % des animaux analys\u00e9s).<\/p>\n\n<p>L\u2019infection r\u00e9siduelle d\u00e9signe la pr\u00e9sence continue d\u2019animaux infect\u00e9s mais non d\u00e9tect\u00e9s par les m\u00e9thodes diagnostiques habituelles. Il s\u2019agit d\u2019un concept \u00abparapluie\u00bb qui inclut:<\/p>\n\n<ul class=\"wp-block-list\"><li>Les animaux infect\u00e9s non r\u00e9acteurs, souvent en phases initiales ou latentes de l\u2019infection, ou immunod\u00e9prim\u00e9s.<\/li><li>Les animaux infect\u00e9s mal diagnostiqu\u00e9s, en raison notamment du moment inappropri\u00e9 pour r\u00e9aliser le test, du non-d\u00e9pistage de l\u2019ensemble du troupeau ou des limites propres aux tests diagnostiques, en particulier l\u2019\u00e9preuve \u00e0 la tuberculine.<\/li><\/ul>\n\n<h3 class=\"wp-block-heading\">Pourquoi est-il important de les d\u00e9tecter ?<\/h3>\n\n<p>L\u2019infection r\u00e9siduelle constitue un obstacle majeur \u00e0 l\u2019\u00e9radication de la maladie, car la bact\u00e9rie peut persister et circuler dans un troupeau sans \u00eatre d\u00e9tect\u00e9e \u00e0 temps, provoquant de nouveaux foyers, parfois des ann\u00e9es plus tard. Cette \u00e9tude souligne l\u2019importance de mener des investigations \u00e9pid\u00e9miologiques approfondies dans les cas r\u00e9currents de tuberculose, afin d\u2019identifier les points faibles du contr\u00f4le et de mieux comprendre comment l\u2019infection se maintient et se transmet. \u00c0 cet \u00e9gard, la surveillance g\u00e9nomique bas\u00e9e sur les technologies de s\u00e9quen\u00e7age massif est un outil tr\u00e8s utile pour comprendre les cha\u00eenes de transmission et am\u00e9liorer les \u00e9valuations de risque.<\/p>\n\n<p>Dans l\u2019ensemble, afin de r\u00e9duire la probabilit\u00e9 de r\u00e9apparition de cette infection persistante, l\u2019\u00e9tude met en avant la n\u00e9cessit\u00e9 d\u2019appliquer des strat\u00e9gies de surveillance bas\u00e9es sur le risque, avec des mesures telles que:<\/p>\n\n<ul class=\"wp-block-list\"><li>Augmenter la fr\u00e9quence des tests diagnostiques,<\/li><li>remplacer plus rapidement les animaux plus \u00e2g\u00e9s, ou<\/li><li>appliquer, si n\u00e9cessaire, le vide sanitaire complet du troupeau.<\/li><\/ul>\n\n<p>Cette \u00e9tude a \u00e9t\u00e9 publi\u00e9e en anglais et en acc\u00e8s libre dans la revue <em data-start=\"7363\" data-end=\"7400\">Transboundary and Emerging Diseases<\/em>:<\/p>\n\n<ul class=\"wp-block-list\"><li>Bernat P\u00e9rez de Val, Mariano Domingo, Alberto Allepuz, Carles Riera, Albert Sanz, Miquel Nofrar\u00edas, Sergio L\u00f3pez-Soria, Enric Vidal. <em data-start=\"7540\" data-end=\"7690\">Long-Term Residual Infection as a Source of Bovine Tuberculosis Reemergence: A Phylogenetic and Epidemiological Investigation of Recurrent Outbreaks<\/em>, Transboundary and Emerging Diseases, 2025. <a class=\"decorated-link\" href=\"https:\/\/doi.org\/10.1155\/tbed\/2446811\" target=\"_new\" rel=\"noopener\" data-start=\"7735\" data-end=\"7771\">https:\/\/doi.org\/10.1155\/tbed\/2446811<\/a>.<\/li><\/ul>\n\n<p>Le travail a \u00e9t\u00e9 financ\u00e9 par le projet INNOTUB II \u2013 EFA115\/04 du programme Interreg POCTEFA 2021\u20132027 et par le contrat de services du DARPA avec l\u2019IRTA-CReSA.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une r\u00e9cente \u00e9tude de l\u2019IRTA-CReSA, r\u00e9alis\u00e9e en collaboration avec l\u2019Universit\u00e9 Autonome de...<\/p>\n","protected":false},"author":4,"featured_media":2792,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59],"tags":[],"class_list":["post-2784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-recherche"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>L\u2019\u00abinfection r\u00e9siduelle\u00bb : un facteur cl\u00e9 dans la persistance de la tuberculose bovine &#187; 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