{"id":976,"date":"2020-05-28T21:39:49","date_gmt":"2020-05-28T19:39:49","guid":{"rendered":"http:\/\/sceaux-lagazette.fr\/?p=976"},"modified":"2020-05-30T11:33:53","modified_gmt":"2020-05-30T09:33:53","slug":"bonne-nouvelle-immunite-covid-19","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2020\/05\/28\/bonne-nouvelle-immunite-covid-19\/","title":{"rendered":"Immunit\u00e9 post-Covid19 : du nouveau"},"content":{"rendered":"\n<p>Jusqu&rsquo;\u00e0 pr\u00e9sent, les r\u00e9ponses \u00e0 la question de l&rsquo;immunit\u00e9 post-Covid19 \u00e9taient assez floues.<br>En fait, plusieurs interrogations sous-tendaient cette question.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Qui \u00e9tait r\u00e9ellement prot\u00e9g\u00e9 apr\u00e8s une infection, notamment pour les patients ayant eu des formes peu s\u00e9v\u00e8res et pour ceux asymptomatiques?<\/li><li>A partir de quand cette protection \u00e9tait-elle acquise?<\/li><li>Combien de temps allait durer cette protection?<\/li><\/ul>\n\n\n\n<p>Le r\u00e9ponse immunologique des personnes atteintes de formes mineures d&rsquo;infection par le SARS-Cov2 \u00e9tait mal caract\u00e9ris\u00e9e.<br>Un communiqu\u00e9 de l&rsquo;Institut Pasteur, \u00e0 la suite d&rsquo;une \u00e9tude r\u00e9alis\u00e9e conjointement par les \u00e9quipes de l&rsquo;Institut Pasteur et celles du CHU de Strasbourg apporte plusieurs informations plut\u00f4t rassurantes.<\/p>\n\n\n\n<p>L&rsquo;\u00e9tude a \u00e9t\u00e9 faite aupr\u00e8s du personnel hospitalier des deux sites des H\u00f4pitaux Universitaires de Strasbourg. La cohorte comptait 160 volontaires, infect\u00e9s par le SRAS-Cov2 et diagnostiqu\u00e9s positifs par un test virologique PCR (ayant d\u00e9velopp\u00e9 des formes mineures de la maladie et n&rsquo;ayant pas n\u00e9cessit\u00e9 d&rsquo;hospitalisation) ont \u00e9t\u00e9 \u00e9tudi\u00e9s. Le communiqu\u00e9 de l\u2019Institut Pasteur r\u00e9sume les r\u00e9sultats.<\/p>\n\n\n\n<p>\u00ab <em>La pr\u00e9sence d\u2019anticorps anti SRAS-CoV-2 a \u00e9t\u00e9 mesur\u00e9e par deux techniques, un test de diagnostic rapide et un test mis au point par l\u2019Institut Pasteur (appel\u00e9 S-Flow). L\u2019activit\u00e9 neutralisante des anticorps a \u00e9t\u00e9 mesur\u00e9e avec un test dit de neutralisation de pseudovirus.<br>Le d\u00e9lai m\u00e9dian entre l&rsquo;apparition des sympt\u00f4mes et le pr\u00e9l\u00e8vement d&rsquo;\u00e9chantillons sanguins \u00e9tait de 24 jours (entre 13-39 jours). Le test immunodiagnostic rapide a d\u00e9tect\u00e9 des anticorps dans 153 (95,6%) des \u00e9chantillons et le test S-Flow dans 159 (99,4%). Des anticorps neutralisants (NAbs) ont \u00e9t\u00e9 d\u00e9tect\u00e9s dans 79%, 92% et 98% des \u00e9chantillons pr\u00e9lev\u00e9s, respectivement 13-20, 21-27 et 28-41 jours apr\u00e8s le d\u00e9but des sympt\u00f4mes.<br>Cette \u00e9tude montre que des anticorps contre le SRAS-CoV-2 sont pr\u00e9sents chez pratiquement tout le personnel hospitalier test\u00e9 pr\u00e9alablement positif par PCR. L&rsquo;activit\u00e9 neutralisante des anticorps augmente au fil du temps, ce qui sugg\u00e8re que les personnes d\u00e9veloppent une immunit\u00e9 potentiellement protectrice.<br>\u00ab On savait que les personnes atteintes de formes s\u00e9v\u00e8res de la maladie d\u00e9veloppaient des anticorps dans les 15 jours qui suivaient le d\u00e9but des signes. On sait maintenant que c\u2019est \u00e9galement vrai pour ceux qui font des formes mineures, m\u00eame si les taux d\u2019anticorps sont vraisemblablement plus faibles \u00bb commente Arnaud Fontanet, un des auteurs de l\u2019\u00e9tude et responsable du d\u00e9partement Sant\u00e9 globale \u00e0 l\u2019Institut Pasteur.<br>\u00ab Notre \u00e9tude montre que les niveaux d\u2019anticorps sont, dans la plupart des cas, compatibles avec une protection contre une nouvelle infection par SRAS-CoV-2, au moins jusqu\u2019\u00e0 40 jours apr\u00e8s le d\u00e9but des signes. L\u2019objectif maintenant est d&rsquo;\u00e9valuer sur le long terme la persistance de la r\u00e9ponse anticorps et sa capacit\u00e9 de neutralisation associ\u00e9e chez ces personnels soignants \u00bb d\u00e9clarent Timoth\u00e9e Bruel et Olivier Schwartz, respectivement chercheur et responsable de l\u2019unit\u00e9 Virus et immunit\u00e9 \u00e0 l\u2019Institut Pasteur.<br>\u00ab Les r\u00e9sultats de cette \u00e9tude sont tr\u00e8s encourageants pour les personnes d\u00e9j\u00e0 infect\u00e9es par le virus car m\u00eame en ayant d\u00e9velopp\u00e9 une forme l\u00e9g\u00e8re de la COVID19 elles sont capables de g\u00e9n\u00e9rer des anticorps protecteurs qui sont pr\u00e9sents au moins 40 jours apr\u00e8s le d\u00e9but des sympt\u00f4mes, reste \u00e0 v\u00e9rifier leur persistance dans le temps. Ces r\u00e9sultats sont \u00e9galement une bonne nouvelle pour les futures strat\u00e9gies vaccinales \u00bb conclut le professeur Samira Fafi-Kremer, chef du service virologie des H\u00f4pitaux Universitaires de Strasbourg et premi\u00e8re auteure de l\u2019\u00e9tude<\/em>. \u00bb<\/p>\n\n\n\n<p>Ainsi, une tr\u00e8s grande majorit\u00e9 des malades atteints d&rsquo;une forme mineure de la Covid-19 d\u00e9velopperait des anticorps s\u00e9ro-neutralisants: c&rsquo;est une excellente nouvelle!<br>Il a \u00e9t\u00e9 montr\u00e9 par ailleurs que les patients ayant pr\u00e9sent\u00e9 une forme plus s\u00e9v\u00e8re de la maladie fabriquaient habituellement des anticorps plus rapidement et avec un titre plus important que les patients ayant des sympt\u00f4mes mod\u00e9r\u00e9s.<br>S\u2019il faut rester prudent, prenons cette nouvelle \u00e9tude comme de bon augure pour les malades atteints de la Covid-19.<br>Deux questions restent en suspens. Qu&rsquo;en est-il des patients asymptomatiques? Combien de temps va durer cette immunit\u00e9?<\/p>\n\n\n\n<p>R\u00e9f : <a rel=\"noreferrer noopener\" href=\"http:\/\/www.pasteur.fr\" target=\"_blank\">www.pasteur.fr<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jusqu&rsquo;\u00e0 pr\u00e9sent, les r\u00e9ponses \u00e0 la question de l&rsquo;immunit\u00e9 post-Covid19 \u00e9taient assez floues.En fait, plusieurs interrogations sous-tendaient cette question. Qui \u00e9tait r\u00e9ellement prot\u00e9g\u00e9 apr\u00e8s une infection, notamment pour les patients ayant eu des formes peu s\u00e9v\u00e8res et pour ceux asymptomatiques? A partir de quand cette protection \u00e9tait-elle acquise? Combien de&#8230;<\/p>\n","protected":false},"author":22,"featured_media":980,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[53],"tags":[182,102,179],"class_list":["post-976","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analyses","tag-anticorps","tag-covid","tag-immunite","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Immunit\u00e9 post-Covid19 : du nouveau La Gazette<\/title>\n<meta name=\"description\" content=\"Apr\u00e8s infection avec une forme mineure de la Covid-19: sommes nous prot\u00e9g\u00e9s? 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