{"id":201561,"date":"2021-01-18T20:25:19","date_gmt":"2021-01-18T19:25:19","guid":{"rendered":"https:\/\/www.realites.com.tn\/?p=201561"},"modified":"2021-01-18T20:25:19","modified_gmt":"2021-01-18T19:25:19","slug":"covid-19-le-variant-californien-l452r-se-repand-a-los-angeles","status":"publish","type":"post","link":"https:\/\/realites.com.tn\/fr\/covid-19-le-variant-californien-l452r-se-repand-a-los-angeles\/","title":{"rendered":"Covid-19 : le \u00ab\u00a0variant californien\u00a0\u00bb L452R se r\u00e9pand \u00e0 Los Angeles"},"content":{"rendered":"<div>Un nouveau variant du Covid-19 est-il en train d\u2019\u00e9merger en Californie, au point de devenir majoritaire ? Le New York Times rapporte que le variant L452R est en train de se propager dans le comt\u00e9 de Los Angeles, l\u2019une des r\u00e9gions les plus touch\u00e9es des Etats-Unis, avec un d\u00e9c\u00e8s d\u00fb au Covid-19 toutes les 7 minutes.<\/div>\n<div>L452R, c\u2019est le nom de ce variant, ne repr\u00e9sentait que 3,8% des 185 cas analys\u00e9s entre le 22 novembre et le 13 d\u00e9cembre par des chercheurs de l&rsquo;Universit\u00e9 de Californie \u00e0 San Francisco. En moins d\u2019un mois, le variant L452R repr\u00e9sentait 25,2% des 147 \u00e9chantillons du 14 d\u00e9cembre au 3 janvier analys\u00e9s par ces m\u00eames chercheurs, ont-ils d\u00e9voil\u00e9 dimanche soir.<\/div>\n<div><\/div>\n<div><strong>*Une impressionnante flamb\u00e9e des cas<\/strong><\/div>\n<div>Un variant qui n\u2019est pas nouveau puisque L452R avait \u00e9t\u00e9 d\u00e9tect\u00e9 pour la premi\u00e8re fois au Danemark en mars et est apparu en Californie en mai. Mais sa propagation au sein de la population inqui\u00e8te, alors que le comt\u00e9 de Los Angeles fait face \u00e0 une flamb\u00e9e impressionnante du nombre de cas.<\/div>\n<div>Alors qu\u2019il avait fallu 10 mois pour enregistrer 400 000 contaminations, il n\u2019a fallu qu\u2019un mois, du 30 novembre au 2 janvier, pour enregistrer 400 000 contaminations suppl\u00e9mentaires, selon des donn\u00e9es du New York Times.<\/div>\n<div><\/div>\n<div><strong>*\u201cDes signes inqui\u00e9tants que cette variante peut \u00eatre hautement transmissible\u201d<\/strong><\/div>\n<div>Une flamb\u00e9e des cas qui pourrait s\u2019expliquer par l\u2019apparition de ce nouveau variant, L452R, qui repr\u00e9sente d\u00e9sormais 25% des nouveaux cas \u00e9tudi\u00e9s. Charles Chiu, qui a dirig\u00e9 le s\u00e9quen\u00e7age du virus au sein de l\u2019Universit\u00e9 de Californie, estime qu\u2019\u201dil y a des signes inqui\u00e9tants que cette variante peut \u00eatre hautement transmissible\u201d, pr\u00e9cisant toutefois ne pas en avoir la preuve pour le moment.<\/div>\n<div>L\u2019\u00e9quipe de Charles Chiu va d\u00e9sormais concentrer ses \u00e9tudes sur la part r\u00e9elle que repr\u00e9sente ce variant L452R dans la population en Californie, en analysant davantage d\u2019\u00e9chantillons, et sur l\u2019\u00e9ventuelle r\u00e9sistance de ce variant aux anticorps et au vaccin, pr\u00e9cise le New York Times.<\/div>\n<div><\/div>\n<div><strong>*Le variant anglais \u00e9galement pr\u00e9sent \u00e0 Los Angeles<\/strong><\/div>\n<div>Pour expliquer la flamb\u00e9e du nombre de cas dans le comt\u00e9 de Los Angeles, les autorit\u00e9s remarquent \u00e9galement que le variant anglais, dont le premier cas a officiellement \u00e9t\u00e9 enregistr\u00e9 samedi, \u00e9tait sans doute en circulation depuis plus longtemps dans le comt\u00e9.<\/div>\n<div>Apr\u00e8s les mutations N501Y, qui concerne le variant britannique et E484K, pour les variants br\u00e9siliens et sud-africains, la mutation L452R va faire l\u2019objet d\u2019une surveillance intensive pour voir si elle est plus contagieuse que la souche classique du SARS-COV-2, comme le redoutent les autorit\u00e9s californiennes, voire si elle peut nuire \u00e0 l\u2019efficacit\u00e9 du vaccin.<\/div>\n<div style=\"text-align: right\">(Yahoo Actualit\u00e9s)<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Un nouveau variant du Covid-19 est-il en train d\u2019\u00e9merger en Californie, au point de devenir majoritaire ? Le New York Times rapporte que le variant L452R est en train de&hellip;<\/p>\n","protected":false},"author":60,"featured_media":201562,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[7],"tags":[],"class_list":["post-201561","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-monde"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Covid-19 : le &quot;variant californien&quot; L452R se r\u00e9pand \u00e0 Los Angeles - R\u00e9alit\u00e9s Magazine<\/title>\n<meta name=\"description\" content=\"Un nouveau variant du Covid-19 est-il en train d\u2019\u00e9merger en Californie, au point de devenir majoritaire ? 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