{"id":19490,"date":"2026-02-27T18:42:23","date_gmt":"2026-02-27T17:42:23","guid":{"rendered":"https:\/\/francelyme.fr\/site\/ufaq\/67-quest-ce-quun-faux-negatif\/"},"modified":"2026-02-28T19:27:24","modified_gmt":"2026-02-28T18:27:24","slug":"67-quest-ce-quun-faux-negatif","status":"publish","type":"ufaq","link":"https:\/\/francelyme.fr\/site\/ufaq\/67-quest-ce-quun-faux-negatif\/","title":{"rendered":"067. Qu\u2019est-ce qu\u2019un\u00a0faux n\u00e9gatif\u00a0\u00bb ?"},"content":{"rendered":"<div class=\"like-button\" style=\"float: right; clear: both; text-align: right; width = 100%;\">\n<!-- Facebook Like Button Vivacity Infotech BEGIN -->\n<div class=\"fb-like\" data-href=\"https:\/\/francelyme.fr\/site\/ufaq\/67-quest-ce-quun-faux-negatif\/\" data-layout=\"box_count\" data-action=\"like\" data-show-faces=\"false\" data-size=\"large\" data-width=\"450\" data-share=\"1\" ><\/div><\/div>\n<!-- Facebook Like Button Vivacity Infotech END -->\n<div id=\"fb-root\"><\/div>\n<style>.ewd-ufaq-faq-header-title a { font-family: Garamond !important; }<\/style><div  class=\"ewd-ufaq-faq-list ewd-ufaq-page-type-distinct ewd-ufaq-category-tabs-\" id='ewd-ufaq-faq-list'>\n\n\t<input type='hidden' name='show_on_load' value='' id='ewd-ufaq-show-on-load' \/>\n<input type='hidden' name='include_category' value='' id='ewd-ufaq-include-category' \/>\n<input type='hidden' name='exclude_category' value='' id='ewd-ufaq-exclude-category' \/>\n<input type='hidden' name='orderby' value='title' id='ewd-ufaq-orderby' \/>\n<input type='hidden' name='order' value='asc' id='ewd-ufaq-order' \/>\n<input type='hidden' name='post_count' value='-1' id='ewd-ufaq-post-count' \/>\n<input type='hidden' name='current_url' value='\/site\/wp-json\/wp\/v2\/ufaq\/19490' id='ewd-ufaq-current-url' \/>\n\t\n\t\n\t<div class='ewd-ufaq-faqs'>\n\n\t\t<div  class=\"ewd-ufaq-faq-div ewd-ufaq-faq-column-count-one ewd-ufaq-faq-responsive-columns- ewd-ufaq-faq-display-style-default ewd-ufaq-can-be-toggled\" id='ewd-ufaq-post-19490-YNahohFwqj' data-post_id='19490'>\n\n\t\t\n\t<div class='ewd-ufaq-faq-title ewd-ufaq-faq-toggle'>\n\t\n\t<a class='ewd-ufaq-post-margin'  href='#' role=\"button\">\n\n\t\t<div class='ewd-ufaq-post-margin-symbol ewd-ufaq-'>\n\t\t\t<span >A<\/span>\n\t\t<\/div>\n\n\t\t<div class='ewd-ufaq-faq-title-text'>\n\n\t\t\t<h4>\n\t\t\t\t067. Qu\u2019est-ce qu\u2019un\u00a0faux n\u00e9gatif\u00a0\u00bb ?\t\t\t<\/h4>\n\n\t\t<\/div>\n\n\t\t<div class='ewd-ufaq-clear'><\/div>\n\n\t<\/a>\n\t\n<\/div>\n\t\n\t<div class='ewd-ufaq-faq-body' >\n\n\t\t\n\t\t\t<div class='ewd-ufaq-post-margin ewd-ufaq-faq-post'>\n\t<div class=\"like-button\" style=\"float: right;clear: both;text-align: right\">\n<!-- Facebook Like Button Vivacity Infotech BEGIN -->\n<div class=\"fb-like\" data-href=\"https:\/\/francelyme.fr\/site\/ufaq\/67-quest-ce-quun-faux-negatif\/\" data-layout=\"box_count\" data-action=\"like\" data-show-faces=\"false\" data-size=\"large\" data-width=\"450\" data-share=\"1\"><\/div><\/div>\n<!-- Facebook Like Button Vivacity Infotech END -->\n<div id=\"fb-root\"><\/div>\n<p style=\"font-weight: 400\">Un \u00ab faux n\u00e9gatif \u00bb (personne malade de Lyme, mais test n\u00e9gatif) peut correspondre \u00e0 quatre situations diff\u00e9rentes :<\/p>\n<ul>\n<li>1) Une erreur de la s\u00e9rologie en deux temps qui, bien que dot\u00e9e d\u2019une tr\u00e8s forte sp\u00e9cificit\u00e9 et d\u2019une tr\u00e8s forte sensibilit\u00e9, n\u2019est pas exempte d\u2019erreurs<\/li>\n<li>2) Test fait trop t\u00f4t apr\u00e8s la piq\u00fbre ou apr\u00e8s le d\u00e9but des sympt\u00f4mes.<\/li>\n<\/ul>\n<p>Au d\u00e9but de l\u2019infection, la s\u00e9rologie peut \u00eatre faussement n\u00e9gative durant les premi\u00e8res semaines. Les anticorps peuvent mettre jusqu\u2019\u00e0 6 \u00e0 8 semaines pour \u00eatre d\u00e9tectables. Cela explique qu\u2019une prise de sang trop pr\u00e9coce ne peut exclure le diagnostic de maladie de Lyme (surtout si la clinique est \u00e9vocatrice). Il est alors n\u00e9cessaire de refaire une s\u00e9rologie quelques semaines plus tard.<\/p>\n<ul>\n<li>3) R\u00e9ponse immunitaire insuffisante ou particuli\u00e8re.<\/li>\n<\/ul>\n<p style=\"font-weight: 400\">L\u2019exp\u00e9rience des patients indique aussi qu\u2019une proportion faible des malades ne sont pas en capacit\u00e9 de produire des anticorps, ce qui de facto conduit \u00e0 ne pas satisfaire le crit\u00e8re s\u00e9rologique. Certaines situations diminuent la production d\u2019anticorps, par exemple l\u2019immunod\u00e9pression. Dans ces cas, une borr\u00e9liose, y compris neurologique, peut \u00eatre difficile \u00e0 confirmer par la seule s\u00e9rologie sanguine, et il existe des cas d\u00e9crits de neuroborr\u00e9liose s\u00e9ron\u00e9gative chez des patients immunod\u00e9prim\u00e9s.<\/p>\n<ul>\n<li>4) Formes o\u00f9 le diagnostic ne repose pas uniquement sur la s\u00e9rologie sanguine.<\/li>\n<\/ul>\n<p style=\"font-weight: 400\">Quand on suspecte une atteinte sp\u00e9cifique (par exemple neurologique), le diagnostic peut n\u00e9cessiter des examens cibl\u00e9s et un raisonnement clinique global, la s\u00e9rologie sanguine seule pouvant \u00eatre insuffisante dans certains contextes. On r\u00e9alisera alors une ponction lombaire afin d\u2019analyser le liquide c\u00e9r\u00e9brospinal, ainsi qu\u2019une imagerie c\u00e9r\u00e9brale avanc\u00e9e pour pr\u00e9ciser le diagnostic.<\/p>\n\n\n<p><\/p>\n<div class=\"like-button\" style=\"float: right;clear: both;text-align: right\">\n<!-- Facebook Like Button Vivacity Infotech BEGIN -->\n<div class=\"fb-like\" data-href=\"https:\/\/francelyme.fr\/site\/ufaq\/67-quest-ce-quun-faux-negatif\/\" data-layout=\"box_count\" data-action=\"like\" data-show-faces=\"false\" data-size=\"large\" data-width=\"450\" data-share=\"1\"><\/div><\/div>\n<!-- Facebook Like Button Vivacity Infotech END -->\n<\/div>\n\t\t\n\t\t\t<div class='ewd-ufaq-author-date'>\n\n\tMis en ligne\n\t\n\tle\n<span class='ewd-ufaq-date'>\n\t27 f\u00e9vrier 2026<\/span>\n<\/div>\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t<div class='ewd-ufaq-ratings'>\n\t\n\t<div class='ewd-ufaq-ratings-label'>\n\t\tCette information vous a-t-elle \u00e9t\u00e9 utile ?\t<\/div>\n\t\n\t<div class='ewd-ufaq-rating-button ewd-ufaq-up-vote ewd-ufaq-ratings-default-image' data-faq_id='19490'>\n\t\t<img decoding=\"async\" src=\"https:\/\/francelyme.fr\/site\/wp-content\/plugins\/ultimate-faqs\/assets\/img\/Thumbs-up-icon.png\" alt=\"Thumbs Up Icon\">\t\t<span>0<\/span>\n\t<\/div>\n\t\n\t<div class='ewd-ufaq-rating-button ewd-ufaq-down-vote ewd-ufaq-ratings-default-image' data-faq_id='19490'>\n\t\t<img decoding=\"async\" src=\"https:\/\/francelyme.fr\/site\/wp-content\/plugins\/ultimate-faqs\/assets\/img\/Thumbs-down-icon.png\" alt=\"Thumbs Down Icon\">\t\t<span>0<\/span>\n\t<\/div>\n<\/div>\n\n<div class='ewd-ufaq-clear'><\/div>\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t<\/div>\n\n<\/div>\n\t<\/div>\n\n\t\n<\/div><div class=\"like-button\" style=\"float: right; clear: both; text-align: right; width = 100%;\">\n<!-- Facebook Like Button Vivacity Infotech BEGIN -->\n<div class=\"fb-like\" data-href=\"https:\/\/francelyme.fr\/site\/ufaq\/67-quest-ce-quun-faux-negatif\/\" data-layout=\"box_count\" data-action=\"like\" data-show-faces=\"false\" data-size=\"large\" data-width=\"450\" data-share=\"1\" ><\/div><\/div>\n<!-- Facebook Like Button Vivacity Infotech END -->\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","ufaq-category":[337],"ufaq-tag":[],"class_list":["post-19490","ufaq","type-ufaq","status-publish","hentry","ufaq-category-diagnostic"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>067. 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