{"id":218121,"date":"2021-08-30T21:01:33","date_gmt":"2021-08-30T20:01:33","guid":{"rendered":"https:\/\/www.realites.com.tn\/?p=218121"},"modified":"2021-08-30T21:01:33","modified_gmt":"2021-08-30T20:01:33","slug":"une-infection-a-la-covid-19-protegerait-mieux-du-variant-delta-que-le-vaccin-pfizer","status":"publish","type":"post","link":"https:\/\/realites.com.tn\/fr\/une-infection-a-la-covid-19-protegerait-mieux-du-variant-delta-que-le-vaccin-pfizer\/","title":{"rendered":"Une infection \u00e0 la Covid-19 prot\u00e9gerait mieux du variant Delta que le vaccin Pfizer"},"content":{"rendered":"<div>Les personnes ayant \u00e9t\u00e9 atteintes de la Covid seraient mieux prot\u00e9g\u00e9es contre le variant Delta que celles immunis\u00e9es avec le vaccin Pfizer-BioNTech, selon des r\u00e9sultats pr\u00e9liminaires publi\u00e9s sur la plateforme medRxiv. L&rsquo;\u00e9tude, men\u00e9e sur 779.000 personnes, est la plus vaste \u00e0 ce jour comparant l&rsquo;immunit\u00e9 naturelle et l&rsquo;immunit\u00e9 vaccinale. Elle montre que les patients vaccin\u00e9s avec deux doses de vaccin Pfizer ont 13 fois plus de risque d&rsquo;\u00eatre infect\u00e9s par le variant Delta, comparativement aux personnes atteintes par le virus lors des vagues de janvier ou f\u00e9vrier 2021. Le risque est encore 5,96 fois plus \u00e9lev\u00e9 compar\u00e9 aux individus touch\u00e9s lors des vagues de 2020, o\u00f9 d&rsquo;autres variants \u00e9taient en circulation, et 7,13 fois plus \u00e9lev\u00e9 concernant les formes symptomatiques. Lorsque les personnes ont \u00e9t\u00e9 \u00e0 la fois touch\u00e9es par le virus et vaccin\u00e9es avec une seule dose, le risque n&rsquo;est plus que de 0,53 fois plus \u00e9lev\u00e9.<\/div>\n<div>\u00ab Ce r\u00e9sultat peut s&rsquo;expliquer par une r\u00e9ponse immunitaire plus compl\u00e8te conf\u00e9r\u00e9e par l&rsquo;infection naturelle \u00bb, sugg\u00e8rent les auteurs. Cette diff\u00e9rence semble \u00eatre sp\u00e9cifique au variant Delta, puisqu&rsquo;une autre \u00e9tude parue dans Nature le 26 ao\u00fbt et portant uniquement sur les variants Alpha et B\u00eata stipule que les s\u00e9rums de personnes convalescentes offrent une protection \u00ab significativement plus faible \u00bb que ceux des personnes vaccin\u00e9es (il s&rsquo;agit toutefois dans cette \u00e9tude non pas de donn\u00e9es r\u00e9elles mais de mesures en laboratoire sur l\u2019efficacit\u00e9 des anticorps). Il se peut \u00e9galement que des biais d\u00e9forment un peu les statistiques, par exemple le fait que les personnes asymptomatiques soient moins bien prises en compte (puisque seules les personnes test\u00e9es positives sont \u00e9valu\u00e9es). Or, on sait que la r\u00e9ponse immunitaire naturelle est plus forte chez les personnes symptomatiques.<\/div>\n<div>Il ne s&rsquo;agit \u00e9videmment pas de conclure qu&rsquo;il vaut mieux attendre d&rsquo;\u00eatre infect\u00e9 naturellement. Selon les derni\u00e8res donn\u00e9es de VaxImpact, une personne non vaccin\u00e9e a un risque multipli\u00e9 par 7 d&rsquo;\u00eatre hospitalis\u00e9e par rapport \u00e0 une personne vaccin\u00e9e. \u00ab Prendre le risque de mourir pour \u00eatre immunis\u00e9 est un tr\u00e8s mauvais calcul \u00bb, conclut Robert Schooley, de l&rsquo;universit\u00e9 de Californie.<\/div>\n<div style=\"text-align: right;\">(Futura)<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Les personnes ayant \u00e9t\u00e9 atteintes de la Covid seraient mieux prot\u00e9g\u00e9es contre le variant Delta que celles immunis\u00e9es avec le vaccin Pfizer-BioNTech, selon des r\u00e9sultats pr\u00e9liminaires publi\u00e9s sur la plateforme&hellip;<\/p>\n","protected":false},"author":60,"featured_media":218123,"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-218121","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 - 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