{"id":205304,"date":"2021-03-01T22:50:54","date_gmt":"2021-03-01T21:50:54","guid":{"rendered":"https:\/\/www.realites.com.tn\/?p=205304"},"modified":"2021-03-01T22:50:54","modified_gmt":"2021-03-01T21:50:54","slug":"le-vaccin-spoutnik-v-favorise-t-il-linfection-au-sida","status":"publish","type":"post","link":"https:\/\/realites.com.tn\/fr\/le-vaccin-spoutnik-v-favorise-t-il-linfection-au-sida\/","title":{"rendered":"Le vaccin Spoutnik V favorise-t-il l&rsquo;infection au Sida ?"},"content":{"rendered":"<div>Apr\u00e8s avoir suspendu la campagne de vaccination avec le vaccin AstraZeneca pour cause d&rsquo;inefficacit\u00e9 contre le variant sud-africain, l&rsquo;Afrique du Sud vient d\u00e9sormais de mettre sous surveillance le vaccin russe Spoutnik V. Ce n&rsquo;est pas ici son manque d&rsquo;efficacit\u00e9 qui est en cause (encore que l&rsquo;on ne dispose pas de donn\u00e9es \u00e0 ce sujet), mais l&rsquo;ad\u00e9novirus utilis\u00e9 comme vecteur viral dans ce vaccin. Cet ad\u00e9novirus de type 5 (Ad5) est en effet soup\u00e7onn\u00e9 d&rsquo;accro\u00eetre le risque d&rsquo;infection au VIH, selon The Lancet.<\/div>\n<div>Suite \u00e0 diff\u00e9rentes \u00e9tudes sur le sujet, une conf\u00e9rence sur les vecteurs Ad5 avait conclu en 2013 que ces derniers pouvaient att\u00e9nuer la r\u00e9ponse immunitaire face au virus VIH et d\u00e9conseill\u00e9 son usage dans les zones \u00e0 forte pr\u00e9valence de Sida. Or, l&rsquo;Afrique du Sud est l&rsquo;un des pays les plus touch\u00e9s au monde, avec une pr\u00e9valence de 19 % parmi les adultes \u00e2g\u00e9s de 15 \u00e0 49 ans. Selon une des hypoth\u00e8ses avanc\u00e9es par les chercheurs, la r\u00e9ponse immunitaire face \u00e0 l&rsquo;Ad5 induirait une diminution de l&rsquo;activit\u00e9 des lymphocytes TDC4 et TDC8 sp\u00e9cifiques au VIH. \u00ab Cette consid\u00e9ration devrait \u00eatre prise en compte avec attention avant la poursuite de la mise au point des vaccins \u00e0 Ad5 contre le SARS-CoV-2 \u00bb, mettent en garde les auteurs de l&rsquo;article de The Lancet.<\/div>\n<div>Manque de chance pour l&rsquo;Afrique du Sud, le vaccin Novavax a \u00e9galement \u00e9t\u00e9 retoqu\u00e9 pour sa faible efficacit\u00e9 au variant. Ne restent plus que ceux de Pfizer-BioNTech, Moderna et Johnson &amp; Johnson (qui fonctionne lui aussi avec un vecteur viral mais diff\u00e9rent de celui du Spoutnik V) pour vacciner les deux tiers de sa population, soit 40 millions de personnes. Une gageure pour ce pays, le plus durement frapp\u00e9 en Afrique par l&rsquo;\u00e9pid\u00e9mie de coronavirus.<\/div>\n<div style=\"text-align: right\"><span style=\"text-transform: initial\">(Futura)<\/span><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Apr\u00e8s avoir suspendu la campagne de vaccination avec le vaccin AstraZeneca pour cause d&rsquo;inefficacit\u00e9 contre le variant sud-africain, l&rsquo;Afrique du Sud vient d\u00e9sormais de mettre sous surveillance le vaccin russe&hellip;<\/p>\n","protected":false},"author":60,"featured_media":205305,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2515],"tags":[],"class_list":["post-205304","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sante"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le vaccin Spoutnik V favorise-t-il l&#039;infection au Sida ? 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