﻿{"id":1999,"date":"2023-01-24T13:54:49","date_gmt":"2023-01-24T12:54:49","guid":{"rendered":"http:\/\/www.ucrc-mali.org\/?p=1999"},"modified":"2023-01-24T15:43:02","modified_gmt":"2023-01-24T14:43:02","slug":"ucrc-cvd-trial-on-safety-and-immunogenicity-of-ebola-vaccines-yields-promising-results","status":"publish","type":"post","link":"https:\/\/ucrc-mali.com\/?p=1999","title":{"rendered":"UCRC\/CVD: Trial on safety and immunogenicity of Ebola vaccines yields promising results"},"content":{"rendered":"\n<p>Ebola virus disease (EVD), whose incidence decreased considerably at the end of 2015, occurs periodically in various countries in sub-Saharan Africa. Although vaccines exist and have already received WHO prequalification against the Zaire ebolavirus species, several questions remain regarding their safety and efficacy, including the durability and early immune responses generated by different vaccin strategies. <\/p>\n\n\n\n<p>In order to address these concerns, a large-scale randomized clinical trial including adults and children at least 1 year old was conducted in Guinea, Liberia, Sierra Leone and Mali, as part of the international PREVAC consortium. At the national level, this study, which took place in 2018 for a period of 12 months, was carried out by the University  Clinical Research Center (UCRC) and the Center for Vaccine Development (CVD), with a staff of 600 participants.<\/p>\n\n\n\n<p>Indeed, the results confirm the safety of three vaccine regimens versus placebo and suggest that an immune response is induced and maintained for up to 12 months. Thus, these data from a large-scale randomized clinical trial add to the evidence for the immunogenicity and safety of the Ad26.ZEBOV-MVA-BN-Filo combination and the rVSV\u0394G-ZEBOVGP vaccine against Ebola virus in adults and children.<\/p>\n\n\n\n<p>&#8220;The results of this trial are very encouraging and demonstrate that these vaccines are safe and well tolerated. This is a key step in the production of effective vaccines against Ebola disease, which can be administered on a large scale to at-risk populations,\u201d said Professor Samba Sow, Principal Investigator of the Mali study site.<\/p>\n\n\n\n<p><strong>Three Vaccine Regimens Tested<\/strong><\/p>\n\n\n\n<p>The multicenter, randomized, placebo-controlled phase 2 trial aimed to measure the rapidity, intensity and durability of the immune responses generated by three different Ebola vaccine regimens, involving the vaccines <em>mentioned above.<\/em> It also evaluated the safety and tolerability of the various products administered.&nbsp; <\/p>\n\n\n\n<p>The first vaccine regimen tested consisted of injecting one dose of Ad26.ZEBOV followed 56 days later by one dose of MVA-BN-Filo.The second regimen consisted of injecting one dose of rVSV\u0394G-ZEBOV-GP. Finally, the third regimen started with one dose of rVSV\u0394G-ZEBOV-GP followed 56 days later with the same vaccine as a booster.  In total, the trial included 1400 adults and 1401 children between 1 and 17 years of age, who were randomized into several groups to test and compare the three regimens versus placebo. <\/p>\n\n\n\n<p>\u201c<em>No safety issues were identified in this trial. With all three vaccine regimens, immune responses were observed from day 14 to month 12.<\/em> \u201c, reassured Professor Seydou Doumbia, Director of the University Clinical Research Center (UCRC). According to Prof. Doumbia, the work of the PREVAC consortium will continue, in order to follow the participants over a period of 5 years, to assess the long-term safety of the vaccines and the durability of the immune response. <\/p>\n\n\n\n<p>The data that will be generated there will make it possible to determine the need to provide a vaccination booster to people who have already been vaccinated, he added. After praising the trial team&#8217;s dedication and looking forward to seeing the long-term safety data, Prof. Sow said, &#8220;<em>These are exciting developments as we get closer to a vaccine that will can help us reduce the incidence and outbreaks of this terrible disease<\/em>.&#8221;<\/p>\n\n\n\n<p>The Mali&#8217;s partners in conducting this trial are the National Institute of Allergy and Infectious Diseases (NIAID), the National Institutes of Health (NIH) in the United States.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ucrc-mali.org\/wp-content\/uploads\/2023\/01\/UCRC_ALL_2.jpg?fit=1024%2C498\" alt=\"\" class=\"wp-image-2009\"\/><figcaption><em>(UCRC ImmunoCore Laboratory)<\/em><\/figcaption><\/figure>\n\n\n\n<p><strong>Mali\u00a0: Un essai sur l&#8217;innocuit\u00e9 et l&#8217;immunog\u00e9nicit\u00e9 des vaccins contre Ebola donne des r\u00e9sultats prometteurs\u00a0!<\/strong><\/p>\n\n\n\n<p>La maladie \u00e0 virus Ebola (MVE) dont\nl&#8217;incidence a consid\u00e9rablement diminu\u00e9 en fin 2015, survient p\u00e9riodiquement\ndans divers pays d&#8217;Afrique subsaharienne. Bien que des vaccins existent et\naient d\u00e9j\u00e0 re\u00e7u la pr\u00e9qualification de l&#8217;OMS contre l&#8217;esp\u00e8ce Za\u00efre ebolavirus, plusieurs\nquestions persistent concernant leurs s\u00e9curit\u00e9 et efficacit\u00e9, incluant la durabilit\u00e9\net la pr\u00e9cocit\u00e9 des r\u00e9ponses immunitaires g\u00e9n\u00e9r\u00e9es par diff\u00e9rentes strat\u00e9gies\nde vaccination. &nbsp;<\/p>\n\n\n\n<p>Afin de r\u00e9pondre \u00e0 ces pr\u00e9occupations,\nun essai clinique randomis\u00e9 \u00e0 grande \u00e9chelle incluant des adultes et des\nenfants \u00e2g\u00e9s d\u2019au moins 1 an, a \u00e9t\u00e9 conduit en Guin\u00e9e, au Liberia, en Sierra\nLeone et au Mali, dans le cadre du consortium international PREVAC. &nbsp;Au niveau national, ladite \u00e9tude qui s\u2019est\nd\u00e9roul\u00e9e en 2018 pour une dur\u00e9e de 12 mois, a \u00e9t\u00e9 men\u00e9e&nbsp;par le Centre\nUniversitaire de Recherche Clinique (UCRC) et le Centre pour le D\u00e9veloppement\ndes Vaccins (CVD), avec un effectif de 600 participants. <\/p>\n\n\n\n<p>En effet, les r\u00e9sultats confirment\nl&#8217;innocuit\u00e9 de trois sch\u00e9mas vaccinaux contre placebo et sugg\u00e8rent qu&#8217;une\nr\u00e9ponse immunitaire est induite et maintenue jusqu&#8217;\u00e0 12 mois. Ainsi, ces\ndonn\u00e9es d&#8217;un essai clinique randomis\u00e9 \u00e0 grande \u00e9chelle, viennent s&#8217;ajouter aux\npreuves de l&#8217;immunog\u00e9nicit\u00e9 et la s\u00e9curit\u00e9 de l&#8217;association\nAd26.ZEBOV-MVA-BN-Filo et le vaccin rVSV\u0394G-ZEBOVGP contre la&nbsp;maladie \u00e0\nvirus Ebola chez les adultes et les enfants. <\/p>\n\n\n\n<p>&#8220;<strong><em>Les r\u00e9sultats de cet essai sont\ntr\u00e8s encourageants et d\u00e9montrent que ces vaccins sont s\u00fbrs et bien tol\u00e9r\u00e9s. Il\ns&#8217;agit d&#8217;une \u00e9tape cl\u00e9 dans la production de vaccins efficaces contre la\nmaladie d&#8217;Ebola, qui pourront \u00eatre administr\u00e9s \u00e0 grande \u00e9chelle aux populations\n\u00e0 risque<\/em><\/strong>.&nbsp;\u00bb, a d\u00e9clar\u00e9 le professeur Samba Sow, chercheur\nprincipal du site malien de l&#8217;\u00e9tude. <\/p>\n\n\n\n<p><strong>Trois sch\u00e9mas vaccinaux test\u00e9s<\/strong><\/p>\n\n\n\n<p>L\u2019essai de phase 2 multicentrique,\nrandomis\u00e9, contr\u00f4l\u00e9 par placebo visait \u00e0 mesurer la rapidit\u00e9, l&#8217;intensit\u00e9 et la\ndurabilit\u00e9 des r\u00e9ponses immunitaires g\u00e9n\u00e9r\u00e9es par trois r\u00e9gimes vaccinaux\ndiff\u00e9rents contre Ebola, impliquant les vaccins mentionn\u00e9s ci-dessus. Elle a\n\u00e9galement \u00e9valu\u00e9 l&#8217;innocuit\u00e9 et la tol\u00e9rance des diff\u00e9rents produits\nadministr\u00e9s.<\/p>\n\n\n\n<p>Le premier sch\u00e9ma vaccinal test\u00e9\nconsistait \u00e0 injecter une dose d&#8217;Ad26.ZEBOV suivie 56 jours plus tard d&#8217;une\ndose de MVA-BN-Filo. Le deuxi\u00e8me sch\u00e9ma consistait \u00e0 injecter une dose de rVSV\u0394G-ZEBOV-GP.\nEnfin, le troisi\u00e8me r\u00e9gime a commenc\u00e9 avec une dose de rVSV\u0394G-ZEBOV-GP suivi 56\njours plus tard avec le m\u00eame vaccin en rappel. Au total, l&#8217;essai a inclus 1400\nadultes et 1401 enfants \u00e2g\u00e9s de 1 \u00e0 17 ans, qui ont \u00e9t\u00e9 randomis\u00e9s en plusieurs\ngroupes pour tester et comparer les trois sch\u00e9mas th\u00e9rapeutiques par rapport au\nplacebo.<\/p>\n\n\n\n<p>&nbsp;\u00ab&nbsp;<strong><em>Aucun\nprobl\u00e8me de s\u00e9curit\u00e9 n&#8217;a \u00e9t\u00e9 identifi\u00e9 dans cet essai. Avec les trois sch\u00e9mas\nvaccinaux, des r\u00e9ponses immunitaires ont \u00e9t\u00e9 observ\u00e9es du 14e jour au 12e mois.<\/em><\/strong>\u00bb, a rassur\u00e9 le professeur Seydou\nDoumbia, Directeur du Centre Universitaire de Recherche Clinique (UCRC). &nbsp;&nbsp;Selon\nPr Doumbia, le travail du consortium PREVAC va se poursuivre, afin de suivre\nles participants sur une p\u00e9riode de 5 ans, pour \u00e9valuer l&#8217;innocuit\u00e9 \u00e0 long\nterme des vaccins et la durabilit\u00e9 de la r\u00e9ponse immunitaire. Les donn\u00e9es qui y\nseront g\u00e9n\u00e9r\u00e9es permettront de situer sur la n\u00e9cessit\u00e9 de fournir un rappel\nvaccinal aux personnes d\u00e9j\u00e0 vaccin\u00e9es, a-t-il ajout\u00e9. <\/p>\n\n\n\n<p>Apr\u00e8s avoir salu\u00e9 le\nd\u00e9vouement de l&#8217;\u00e9quipe de l&#8217;essai et dit attendre avec impatience de voir les\ndonn\u00e9es sur la s\u00e9curit\u00e9 \u00e0 long terme<strong><em>, <\/em><\/strong>Pr Sow a affirm\u00e9 que<strong><em>\n\u00ab&nbsp;Ce sont des d\u00e9veloppements passionnants alors que nous nous rapprochons\nd&#8217;un vaccin qui peut nous aider \u00e0 r\u00e9duire l&#8217;incidence et les \u00e9pid\u00e9mies de cette\nterrible maladie.&#8221;<\/em><\/strong><\/p>\n\n\n\n<p>Rappelons que les partenaires du Mali\ndans la conduite de cet essai sont l&#8217;Institut national des allergies et des\nmaladies infectieuses (NIAID), les Instituts nationaux de la sant\u00e9 (NIH) aux\n\u00c9tats-Unis. <\/p>\n\n\n\n<p><strong>Cellule de Communication de l\u2019UCRC-Mali<\/strong> (<a href=\"http:\/\/www.ucrc-mali.org\/\">http:\/\/www.ucrc-mali.org\/<\/a> )<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ebola virus disease (EVD), whose incidence decreased considerably at the end of 2015, occurs periodically in various countries in sub-Saharan Africa. Although vaccines exist and have already received WHO prequalification against the Zaire ebolavirus species, several questions remain regarding their safety and efficacy, including the durability and early immune responses generated&hellip;<\/p>\n","protected":false},"author":2,"featured_media":2007,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1999","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=\/wp\/v2\/posts\/1999","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1999"}],"version-history":[{"count":7,"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=\/wp\/v2\/posts\/1999\/revisions"}],"predecessor-version":[{"id":2011,"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=\/wp\/v2\/posts\/1999\/revisions\/2011"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=\/wp\/v2\/media\/2007"}],"wp:attachment":[{"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1999"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1999"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ucrc-mali.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}