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{"id":29772,"date":"2020-08-10T09:29:31","date_gmt":"2020-08-10T07:29:31","guid":{"rendered":"https:\/\/vosgesinfo.fr\/remiremontinfo\/2020\/08\/covid-19-test-usage\/"},"modified":"2020-08-10T09:29:31","modified_gmt":"2020-08-10T07:29:31","slug":"covid-19-test-usage","status":"publish","type":"post","link":"https:\/\/vi.si-developpement.fr\/remiremontinfo\/2020\/08\/covid-19-test-usage\/","title":{"rendered":"Covid 19: quel test, pour quel usage?"},"content":{"rendered":"

\"GP-file-dattente\"<\/a>Aux portes des laboratoires m\u00e9dicaux, on trouve des malades avec sympt\u00f4mes, des cas contacts, des vacanciers \u00e0 qui on demande des garanties sanitaires dans leur pays d\u2019arriv\u00e9e, ou des angoiss\u00e9s du Covid-19 qui veulent tout simplement savoir s\u2019ils ont contract\u00e9 le virus.<\/h2>\n

Hormis lors des campagnes diligent\u00e9es par l\u2019ARS sous chapiteau comme fin juillet \u00e0 Epinal, il est difficile de s\u2019y retrouver face \u00e0 toutes les options entre les tests sur ordonnance, ceux rembours\u00e9s ou non, les tests PCR ou les diagnostics s\u00e9rologiques.<\/p>\n

K\u00e9zako<\/strong> ?<\/strong><\/h3>\n

Il y a deux cat\u00e9gories de tests: les virologiques, qui sont les diagnostics les plus demand\u00e9s et pratiqu\u00e9s, aussi appel\u00e9s RT-PCR ou PCR, qui permettent de savoir au moment du pr\u00e9l\u00e8vement si on est contamin\u00e9 par le Covid-19 ( cela d\u00e9bouche en cas de positivit\u00e9, \u00e0 une mise en quatorzaine). Et les tests s\u00e9rologiques, qui s\u2019effectuent par pr\u00e9l\u00e8vement sanguin et permettent de savoir si on a d\u00e9velopp\u00e9 des anticorps contre le coronavirus. Le second test est une information qui permet de savoir si on a \u00e9t\u00e9 infect\u00e9 dans le pass\u00e9. Et donc susceptible d\u2019\u00eatre potentiellement immunis\u00e9, alors qu\u2019il n\u2019y a aucune certitude scientifique \u00e0 ce jour.<\/p>\n

Les tests RT-PCR demandent un minimum de 3 heures pour obtenir un r\u00e9sultat, alors que 20 minutes sont n\u00e9cessaires pour le test s\u00e9rologique. Les tests salivaires virologiques Easycov, moins intrusifs, qui demandent une heure et fonctionnent par colorim\u00e9trie, sont test\u00e9s actuellement ( notamment dans certains a\u00e9roports ) mais leur taux \u00e9lev\u00e9 de faux n\u00e9gatifs ( aux alentours de 34%) pose probl\u00e8me et ne permet pas sa validation et son d\u00e9ploiement en France pour le moment. Aux \u00c9tats-Unis, et bien que non autoris\u00e9s par l\u2019agence am\u00e9ricaine des m\u00e9dicaments, des tests sur bandelettes existent aussi. Ils sont rapides d\u2019utilisation et bon march\u00e9 mais ils ont aussi de forts taux de faux n\u00e9gatifs.<\/p>\n

Un seul test virologique agr\u00e9\u00e9<\/strong><\/h3>\n

Il n\u2019y a qu\u2019une seule fa\u00e7on autoris\u00e9e d\u2019effectuer un test PCR : par pr\u00e9l\u00e8vement naso-pharyng\u00e9, avec un \u00e9couvillon gliss\u00e9 dans une narine et par un personnel habilit\u00e9. C\u2019est le diagnostic le plus fiable afin de savoir si une infection est en cours chez le patient. Mais si le test est fait trop t\u00f4t, dans les premiers jours apr\u00e8s la contamination, le virus n\u2019est pas encore install\u00e9 dans le nez. S\u2019il est fait trop tard, on ne le retrouve plus car il a migr\u00e9 dans les poumons. Les tests PCR ne n\u00e9cessitent plus de prescription d\u2019un m\u00e9decin depuis fin juillet et ils sont totalement pris en charge par l\u2019assurance maladie. Hormis lors de campagnes sp\u00e9cifiques, ils s\u2019effectuent en laboratoire d\u2019analyse.<\/p>\n

Les tests s\u00e9rologiques<\/strong><\/h3>\n

Il s\u2019agit d\u2019un pr\u00e9l\u00e8vement sanguin, qui peut s\u2019effectuer en pharmacie ( test Trod, d\u2019environ 15 euros, quasi instantan\u00e9 ) ou en laboratoire ( 24 heures). Ils informent seulement le patient d\u2019une \u00e9ventuelle infection pass\u00e9e. Ils sont requis par certaines compagnies a\u00e9riennes avant un voyage \u00e0 l\u2019\u00e9tranger. Mais ce n\u2019est pas parce qu\u2019un test s\u00e9rologique est n\u00e9gatif, que le patient n\u2019a pas, dans le pass\u00e9, contract\u00e9 le coronavirus ( dans certains cas les anticorps apparaissent plus de 40 jours apr\u00e8s la contamination). En laboratoire, les pr\u00e9l\u00e8vements sanguins sans ordonnance ne sont pas rembours\u00e9s et co\u00fbtent de 10 \u00e0 20 euros. Sauf si on dispose d\u2019une ordonnance, et dans ce cas c\u2019est l\u2019assurance maladie qui prend les frais en charge.<\/p>\n

Le bon sens voudrait que la r\u00e9p\u00e9tition \u00e0 une semaine d\u2019intervalle et la combinaison des deux tests s\u2019impose d\u00e8s lors qu\u2019on est au contact de personnes vuln\u00e9rables ou que l\u2019on veut \u00e9viter une quarantaine \u00e0 l\u2019arriv\u00e9e dans un pays \u00e9tranger.<\/p>\n","protected":false},"excerpt":{"rendered":"

Aux portes des laboratoires m\u00e9dicaux, on trouve des malades avec sympt\u00f4mes, des cas contacts, des vacanciers \u00e0 qui on demande […]<\/p>\n","protected":false},"author":39,"featured_media":29773,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,18],"tags":[],"acf":[],"yoast_head":"\nCovid 19: quel test, pour quel usage? - Remiremont Info<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Covid 19: quel test, pour quel usage? - Remiremont Info\" \/>\n<meta property=\"og:description\" content=\"Aux portes des laboratoires m\u00e9dicaux, on trouve des malades avec sympt\u00f4mes, des cas contacts, des vacanciers \u00e0 qui on demande […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/vi.si-developpement.fr\/remiremontinfo\/2020\/08\/covid-19-test-usage\/\" \/>\n<meta property=\"og:site_name\" content=\"Remiremont Info\" \/>\n<meta property=\"article:published_time\" content=\"2020-08-10T07:29:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/vi.si-developpement.fr\/app\/uploads\/sites\/5\/2024\/09\/202008gp-file-dattente.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"450\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Phj\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Phj\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/vi.si-developpement.fr\/remiremontinfo\/2020\/08\/covid-19-test-usage\/\",\"url\":\"https:\/\/vi.si-developpement.fr\/remiremontinfo\/2020\/08\/covid-19-test-usage\/\",\"name\":\"Covid 19: quel test, pour quel usage? 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