{"id":11628,"date":"2025-11-12T16:30:56","date_gmt":"2025-11-12T15:30:56","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/infection-h5n1-sans-symptomes-chez-lhomme-les-preuves-restent-rares\/"},"modified":"2025-11-12T16:30:57","modified_gmt":"2025-11-12T15:30:57","slug":"infection-h5n1-sans-symptomes-chez-lhomme-les-preuves-restent-rares","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/infection-h5n1-sans-symptomes-chez-lhomme-les-preuves-restent-rares\/","title":{"rendered":"Infection H5N1 sans sympt\u00f4mes chez l\u2019homme : les preuves restent rares"},"content":{"rendered":"
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Des chercheurs des Centers for Disease Control and Prevention (CDC) des \u00c9tats-Unis ont identifi\u00e9 quelques cas d’infection humaine asymptomatique par le virus de la grippe aviaire A (H5N1).<\/p>\n

Apprendre \u00e0 conna\u00eetre la grippe aviaire H5N1<\/h2>\n

Largement r\u00e9pandu chez les oiseaux sauvages du monde entier, le H5N1 provoque depuis plusieurs ann\u00e9es des \u00e9pid\u00e9mies chez les volailles. Les r\u00e9centes hausses de prix des \u0153ufs aux \u00c9tats-Unis, li\u00e9es \u00e0 la \u00ab inflation \u00bb, \u00e9taient en grande partie dues \u00e0 une perturbation de la cha\u00eene d’approvisionnement en \u0153ufs provoqu\u00e9e par le virus, qui a forc\u00e9 l’abattage de troupeaux entiers pour emp\u00eacher une nouvelle propagation.<\/p>\n

Depuis les premiers cas humains enregistr\u00e9s en 1997, plus d\u2019un millier de personnes ont \u00e9t\u00e9 infect\u00e9es par la souche hautement pathog\u00e8ne H5N1 dans 25 pays. Selon le CDC, le taux de mortalit\u00e9 d\u00fb au H5N1 observ\u00e9 \u00e0 l’\u00e9chelle mondiale est d’environ 50 %. La plupart des cas ont \u00e9t\u00e9 attribu\u00e9s \u00e0 une exposition \u00e0 des volailles infect\u00e9es, les cas r\u00e9cents chez des vaches laiti\u00e8res am\u00e9ricaines \u00e9tant li\u00e9s \u00e0 plusieurs cas humains r\u00e9cents.<\/p>\n

Bien que l\u2019infection asymptomatique par les virus de la grippe saisonni\u00e8re soit bien document\u00e9e, on en sait beaucoup moins sur les infections silencieuses par le H5N1 chez l\u2019homme. De telles infections pourraient fausser les \u00e9valuations des risques si elles ne sont pas d\u00e9tect\u00e9es et sont difficiles \u00e0 confirmer car les tests s\u00e9rologiques et mol\u00e9culaires varient en sensibilit\u00e9 et en fiabilit\u00e9.<\/p>\n

Revue globale pour identifier les cas asymptomatiques<\/h2>\n

Dans l’\u00e9tude \u00ab Asymptomatic Human Infections With Avian Influenza A(H5N1) Confirmed by Molecular and Serologic Testing: A Scoping Review \u00bb, publi\u00e9e dans R\u00e9seau JAMA ouvert<\/i>les enqu\u00eateurs ont recherch\u00e9 des rapports dans sept bases de donn\u00e9es scientifiques jusqu’au 25 ao\u00fbt 2025.<\/p>\n

L’objectif \u00e9tait de trouver des cas humains document\u00e9s r\u00e9pondant aux d\u00e9finitions de l’Organisation mondiale de la sant\u00e9 pour la confirmation mol\u00e9culaire et s\u00e9rologique ou la confirmation mol\u00e9culaire seule.<\/p>\n

Petit nombre de cas confirm\u00e9s d\u00e9tect\u00e9s dans le monde<\/h2>\n

Sur 1\u00a0567 rapports examin\u00e9s, 10 \u00e9tudes r\u00e9pondaient aux crit\u00e8res d’inclusion d’une infection asymptomatique signal\u00e9e avec des preuves de tests respiratoires ou s\u00e9riques, \u00e0 l’exclusion des \u00e9tudes qui reposaient uniquement sur la d\u00e9tection d’anticorps.<\/p>\n

Au sein des 10 \u00e9tudes, 18 infections asymptomatiques \u00e0 H5N1 ont \u00e9t\u00e9 signal\u00e9es, dont deux ayant obtenu une confirmation mol\u00e9culaire et s\u00e9rologique et 16 confirm\u00e9es par des tests mol\u00e9culaires uniquement.<\/p>\n

Les deux cas enti\u00e8rement confirm\u00e9s sont survenus chez des adultes du Pakistan et du Vietnam identifi\u00e9s lors d’enqu\u00eates sur les contacts familiaux de parents symptomatiques. Un individu a probablement contract\u00e9 le virus par transmission interhumaine, tandis que l\u2019autre a \u00e9t\u00e9 directement expos\u00e9 \u00e0 des poulets infect\u00e9s.<\/p>\n

Parmi les 16 cas confirm\u00e9s mol\u00e9culairement, 11 ont \u00e9t\u00e9 identifi\u00e9s lors de la surveillance d’individus expos\u00e9s \u00e0 des volailles infect\u00e9es au Bangladesh, en Espagne et au Royaume-Uni. Les cinq autres ont \u00e9t\u00e9 d\u00e9couverts gr\u00e2ce \u00e0 des enqu\u00eates men\u00e9es aupr\u00e8s de m\u00e9nages au Vietnam et au Cambodge.<\/p>\n

La plupart manquaient de confirmation s\u00e9rologique. Certaines d\u00e9tections, en particulier celles pr\u00e9sentant des valeurs seuils de cycle \u00e9lev\u00e9es, peuvent refl\u00e9ter une contamination environnementale plut\u00f4t qu’une infection. Seuls quelques cas impliquaient des tests de suivi ou un traitement antiviral.<\/p>\n

Lacunes dans les donn\u00e9es et besoins futurs en mati\u00e8re de recherche<\/h2>\n

Les auteurs du CDC concluent que les infections asymptomatiques par le H5N1 chez l’homme sont rares et manquent souvent de la confirmation s\u00e9rologique requise pour confirmer l’infection. Une surveillance incoh\u00e9rente des sympt\u00f4mes a encore limit\u00e9 l\u2019interpr\u00e9tation.<\/p>\n

Des recherches futures pourraient clarifier la fr\u00e9quence \u00e0 laquelle le H5N1 infecte les humains sans sympt\u00f4mes, la dur\u00e9e de l’excr\u00e9tion du virus et si les individus asymptomatiques peuvent transmettre l’infection. De telles informations renforceraient l\u2019\u00e9valuation des risques d\u2019\u00e9pid\u00e9mie et les mesures de contr\u00f4le des infections. La collecte compl\u00e8te de donn\u00e9es aupr\u00e8s de personnes expos\u00e9es mais asymptomatiques reste essentielle pour orienter les futures r\u00e9ponses de sant\u00e9 publique.<\/p>\n

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\u00c9crit pour vous par notre auteur Justin Jackson, \u00e9dit\u00e9 par Sadie Harley, et v\u00e9rifi\u00e9 et r\u00e9vis\u00e9 par Robert Egan, cet article est le r\u00e9sultat d’un travail humain minutieux. Nous comptons sur des lecteurs comme vous pour maintenir en vie le journalisme scientifique ind\u00e9pendant. Si ce reporting vous int\u00e9resse, pensez \u00e0 faire un don (surtout mensuel). Vous obtiendrez un sans publicit\u00e9<\/b> compte en guise de remerciement.\n <\/p>\n<\/p><\/div>\n

<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Des chercheurs des Centers for Disease Control and Prevention (CDC) des \u00c9tats-Unis ont identifi\u00e9 quelques<\/p>\n","protected":false},"author":1,"featured_media":11629,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[56,2981,1238,49,1060,1190,1052,2381,26,42],"class_list":["post-11628","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-chez","tag-h5n1","tag-infection","tag-les","tag-lhomme","tag-preuves","tag-rares","tag-restent","tag-sans","tag-symptomes","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"yoast_head":"\nInfection H5N1 sans sympt\u00f4mes chez l\u2019homme : les preuves restent rares - RVH-Synergie.org<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rvh-synergie.org\/actualites\/infection-h5n1-sans-symptomes-chez-lhomme-les-preuves-restent-rares\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Infection H5N1 sans sympt\u00f4mes chez l\u2019homme : les preuves restent rares - 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