{"id":19117,"date":"2023-08-24T11:30:29","date_gmt":"2023-08-24T08:30:29","guid":{"rendered":"https:\/\/pasteur.mg\/?p=14503"},"modified":"2025-07-02T14:38:58","modified_gmt":"2025-07-02T11:38:58","slug":"les-valeurs-du-cycle-seuil-de-la-rt-pcr-refletent-la-dynamique-epidemique-de-la-covid-19-a-madagascar","status":"publish","type":"post","link":"https:\/\/www.pasteur.mg\/en\/les-valeurs-du-cycle-seuil-de-la-rt-pcr-refletent-la-dynamique-epidemique-de-la-covid-19-a-madagascar\/","title":{"rendered":"Les valeurs du cycle seuil de la RT-PCR refl\u00e8tent la dynamique \u00e9pid\u00e9mique de la COVID-19 \u00e0 Madagascar"},"content":{"rendered":"<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"14504\" data-permalink=\"https:\/\/www.pasteur.mg\/en\/les-valeurs-du-cycle-seuil-de-la-rt-pcr-refletent-la-dynamique-epidemique-de-la-covid-19-a-madagascar\/pcr-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.pasteur.mg\/wp-content\/uploads\/2023\/08\/PCR.jpg?fit=1920%2C1080&amp;ssl=1\" data-orig-size=\"1920,1080\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"PCR\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.pasteur.mg\/wp-content\/uploads\/2023\/08\/PCR.jpg?fit=1024%2C576&amp;ssl=1\" class=\"wp-image-14504 aligncenter\" src=\"https:\/\/i0.wp.com\/www.pasteur.mg\/wp-content\/uploads\/2023\/08\/PCR.jpg?resize=838%2C472&#038;ssl=1\" alt=\"\" width=\"838\" height=\"472\" \/><\/p>\n<p>L\u2019\u00e9pid\u00e9mie de COVID-19 s\u2019est manifest\u00e9e \u00e0 travers le monde par la survenue de diff\u00e9rentes vagues caract\u00e9ris\u00e9es par des pics de contamination. L\u2019estimation de la trajectoire de l\u2019\u00e9pid\u00e9mie dans une r\u00e9gion ou un pays donn\u00e9 et de ses pics d\u2019incidence gr\u00e2ce aux donn\u00e9es \u00e9pid\u00e9miologiques est cruciale pour mettre en place une politique ad\u00e9quate de sant\u00e9 publique. Ces donn\u00e9es sont bas\u00e9es principalement sur le nombre de cas positifs diagnostiqu\u00e9s. Cependant ces donn\u00e9es peuvent \u00eatre biais\u00e9es pour diff\u00e9rentes raisons.<\/p>\n<p>Le diagnostic de confirmation de la COVID-19 s\u2019effectue par amplification du mat\u00e9riel g\u00e9n\u00e9tique du virus pr\u00e9sent dans un pr\u00e9l\u00e8vement nasopharyng\u00e9 par la technique RT-PCR (\u00ab\u00a0Reverse Transcription-Polymerase Chain Reaction\u00a0\u00bb). Au cours d\u2019une RT-PCR, un nombre de cycle seuil (appel\u00e9 \u00ab\u00a0Cycle threshold\u00a0\u00bb ou \u00ab\u00a0Ct\u00a0\u00bb) est d\u00e9fini. La valeur de ce cycle seuil (Ct) correspond au nombre de cycles n\u00e9cessaires permettant la d\u00e9tection et la quantification du virus. Plus la charge virale est importante dans un pr\u00e9l\u00e8vement plus la valeur de Ct observ\u00e9e est faible. Le Ct est donc une valeur semi-quantitative qui permet d\u2019estimer la quantit\u00e9 de mat\u00e9riel g\u00e9n\u00e9tique viral pr\u00e9sent dans l\u2019\u00e9chantillon.<\/p>\n<p>Une \u00e9tude<sup>1<\/sup> men\u00e9e par l\u2019unit\u00e9 de Virologie, l\u2019unit\u00e9 d\u2019Epid\u00e9miologie et de recherche clinique de l\u2019Institut Pasteur de Madagascar, et le d\u00e9partement d\u2019Ecologie et d\u2019Evolution de l\u2019Universit\u00e9 de Chicago a \u00e9tudi\u00e9 la relation entre les valeurs de Ct observ\u00e9es et la dynamique de l\u2019\u00e9pid\u00e9mie de COVID-19 \u00e0 Madagascar. Les donn\u00e9es de surveillance biologique issue de la premi\u00e8re vague \u00e9pid\u00e9mique ont pu \u00eatre exploit\u00e9es afin de d\u00e9crire la dynamique du COVID-19 \u00e0 Madagascar. Ainsi, en appliquant diff\u00e9rents mod\u00e8les math\u00e9matiques aux valeurs de Ct obtenues par RT-PCR, les auteurs ont pu d\u00e9montrer qu\u2019un pic d&rsquo;infections \u00e0 charge virale \u00e9lev\u00e9e \u2013 donc \u00e0 faible valeur de Ct \u2013 co\u00efncidait temporellement avec les taux de croissance \u00e9pid\u00e9mique observ\u00e9s en temps r\u00e9el \u00e0 partir de donn\u00e9es \u00e9pid\u00e9miologiques nationales disponibles au niveau du Minist\u00e8re de la Sant\u00e9 Publique. Les auteurs ont \u00e9galement pu d\u00e9montrer un effet statistiquement significatif de la dur\u00e9e de l&rsquo;infection sur la valeur du Ct, ce qui sugg\u00e8re que le Ct peut \u00eatre utilis\u00e9 comme biomarqueur du stade auquel un individu a \u00e9t\u00e9 pr\u00e9lev\u00e9 au cours de son infection. Par extension, la distribution des Ct au niveau de la population \u00e0 un moment donn\u00e9 peut \u00eatre utilis\u00e9e pour estimer la dynamique de l\u2019\u00e9pid\u00e9mie dans la population.<\/p>\n<p>Cette \u00e9tude sugg\u00e8re que la notification des valeurs de Ct pourrait apporter une information importante \u00e0 un syst\u00e8me de surveillance, permettant de pr\u00e9voir ou d\u2019anticiper des pics d&rsquo;incidence dans des zones o\u00f9 la notification des cas reste limit\u00e9e.<\/p>\n<p><sup>1<\/sup>Lien\u00a0: <a href=\"https:\/\/doi.org\/10.1016\/j.epidem.2021.100533\">https:\/\/doi.org\/10.1016\/j.epidem.2021.100533<\/a>.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>L\u2019\u00e9pid\u00e9mie de COVID-19 s\u2019est manifest\u00e9e \u00e0 travers le monde par la survenue de diff\u00e9rentes vagues caract\u00e9ris\u00e9es par des pics de contamination. L\u2019estimation de la trajectoire de l\u2019\u00e9pid\u00e9mie dans une r\u00e9gion ou un pays donn\u00e9 et de ses pics d\u2019incidence gr\u00e2ce aux donn\u00e9es \u00e9pid\u00e9miologiques est cruciale pour mettre en place une politique ad\u00e9quate de sant\u00e9 publique. [&hellip;]<\/p>","protected":false},"author":19,"featured_media":14504,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[616,750],"tags":[],"class_list":["post-19117","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-controle-des-maladies-infectieuses","category-vulgarisation-scientifique"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Les valeurs du cycle seuil de la RT-PCR refl\u00e8tent la dynamique \u00e9pid\u00e9mique de la COVID-19 \u00e0 Madagascar - Institut Pasteur de Madagascar<\/title>\n<meta name=\"description\" content=\"L\u2019\u00e9pid\u00e9mie de COVID-19 s\u2019est manifest\u00e9e \u00e0 travers le monde par la survenue de diff\u00e9rentes vagues caract\u00e9ris\u00e9es par des pics de contamination. 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