
{"id":27603,"date":"2025-10-21T07:06:09","date_gmt":"2025-10-21T07:06:09","guid":{"rendered":"https:\/\/aboutsmallruminants.com\/?p=27603"},"modified":"2026-05-12T11:13:37","modified_gmt":"2026-05-12T11:13:37","slug":"key-points-for-the-diagnosis-of-chlamydia-abortus","status":"publish","type":"post","link":"https:\/\/aboutsmallruminants.com\/fr\/key-points-for-the-diagnosis-of-chlamydia-abortus\/","title":{"rendered":"Key points for the diagnosis of \ud835\ude0a. \ud835\ude22\ud835\ude23\ud835\ude30\ud835\ude33\ud835\ude35\ud835\ude36\ud835\ude34: act quickly to effectively control it"},"content":{"rendered":"<div class=\"intro-text\">\n<p>Identifying the causative agent of abortion in sheep and goats is essential for implementing effective control measures. In the case of <em>Chlamydia abortus<\/em>, correct diagnosis depends on acting quickly, knowing what samples to collect and when.<\/p>\n<\/div>\n<p>&nbsp;<\/p>\n<h2>What might lead us to suspect a <em>C. abortus<\/em> infection?<\/h2>\n<div style=\"padding-left: 2rem; margin: 0;\">\n<p>&#8211; Abortions at the end of pregnancy<\/p>\n<p>&#8211; Weak lambs or kids<\/p>\n<p>&#8211; Neonatal mortality<\/p>\n<p>&#8211;<a href=\"https:\/\/aboutsmallruminants.com\/fr\/fausses-couches-exploitation-brebis-chevres\/\"> <strong>Outbreaks of abortions<\/strong><\/a><\/p>\n<p>&#8211; Absence of other signs in adult animals<\/p>\n<p>&#8211; Necrotic placentitis<\/p>\n<\/div>\n<p>&nbsp;<\/p>\n<p>These <strong>signs<\/strong> may be indicative of <em><strong><a href=\"https:\/\/aboutsmallruminants.com\/fr\/comprendre-chlamydia-abortus-comment-la-maladie-se-presente-t-elle\/\">C. abortus infection<\/a>,<\/strong><\/em> although other pathogens such as Salmonella, Coxiella, or Toxoplasma can also cause similar symptoms.<\/p>\n<blockquote class=\"pullquote align-center\" style=\"font-size: 20pt;\"><p>Laboratory confirmation of the pathogen involved is always necessary.<\/p><\/blockquote>\n<h2>Recommendations for proper diagnosis: What samples should be taken?<\/h2>\n<div style=\"padding-left: 2rem; margin: 0;\">\n<p><strong>&#8211; Placenta:<\/strong> this is the<strong> sample of choice<\/strong>. Try to collect the damaged areas for a proper <a href=\"https:\/\/aboutsmallruminants.com\/fr\/avortements-petits-ruminants-importance-diagnostic-techniques\/\">diagnosis<\/a>.<\/p>\n<p><strong>&#8211; Aborted fetus:<\/strong> the <strong>entire fetus<\/strong> can be sent. The most useful samples are wet wool, <strong>abomasal <\/strong>contents, and internal organ fragments.<\/p>\n<p><strong>&#8211; Vaginal swabs:<\/strong> in females that have <strong>recently aborted<\/strong> (24-72 hours), vaginal swabs are useful when no placenta or fetus is available.<\/p>\n<p><strong>&#8211; Blood serum:<\/strong> it should be taken <strong>after abortion<\/strong> or birth, when <strong>seroconversion<\/strong> (increase in antibodies) occurs.<\/p>\n<div style=\"display: flex; justify-content: center; align-items: center; gap: 10px; flex-wrap: wrap;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2025\/10\/img1-150x150.png\" alt=\"Imagen 1\" width=\"150\" height=\"150\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2025\/10\/img2-150x150.png\" alt=\"Imagen 2\" width=\"150\" height=\"150\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2025\/10\/img3-150x150.png\" alt=\"Imagen 3\" width=\"150\" height=\"150\" \/><\/div>\n<div style=\"margin-top: 5px; font-size: 14px; font-style: italic; text-align: center;\">Fig 1. Samples of choice: placenta, fetus, vaginal swab, and serum<\/div>\n<blockquote class=\"pullquote align-center\" style=\"font-size: 20pt;\">\n<p style=\"text-align: center;\">Sampling should be done as soon as possible to increase the chances of detection.<\/p>\n<\/blockquote>\n<h2>What are the best techniques?<\/h2>\n<p><strong>PCR:<\/strong> the most recommended method due to its high <strong>sensitivity<\/strong>, <strong>specificity<\/strong>, and speed.The <strong>timing<\/strong> of sampling is critical. The <a href=\"https:\/\/aboutsmallruminants.com\/fr\/chlamydia-salmonella-transmission-controle\/\"><strong>excretion<\/strong><\/a> of <em>Chlamydia<\/em> is at its highest in the first few hours after abortion. If the sample is collected late or is degraded, there is a risk of <strong>false negatives<\/strong>.<\/p>\n<blockquote class=\"pullquote align-center\" style=\"font-size: 20pt;\"><p>If possible, PCR should be the first choice<\/p><\/blockquote>\n<p><strong>ELISA:<\/strong> Enables the detection of <strong>antibodies<\/strong> against<em> C. abortus.<\/em> In the <strong>3 months<\/strong> after abortion an<strong>\u00a0increase in antibodies<\/strong> usually occurs, and they may be detectable during this period.<\/p>\n<div><\/div>\n<div style=\"margin-bottom: 20px; text-align: left;\">\n<table style=\"width: 100%; max-width: 1232px; border-collapse: collapse; margin: 0 auto; table-layout: auto;\">\n<tbody>\n<tr>\n<td style=\"border: 1px solid #000; padding: 5px;\" rowspan=\"2\"><strong>Method<\/strong><\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\" colspan=\"2\"><strong>Objective<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 5px;\">Confirm pathogen<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">Prevalence\/surveillance<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 5px;\">PCR<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">+++<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">++<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 5px;\">ELISA<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">++<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">+++<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 5px;\">Complement fixation<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">+<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">+<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 5px;\">Immunohistochemistry<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">++<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">+<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 5px;\">Smear staining<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">+<\/td>\n<td style=\"border: 1px solid #000; padding: 5px;\">&#8211;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div style=\"margin-top: 5px; font-size: 14px; font-style: italic; text-align: center;\">Fig 2. We can use different diagnostic techniques depending on the purpose<\/div>\n<\/div>\n<p style=\"text-align: left;\"><strong>Serology<\/strong> has some limitations. For example, it is not useful in <strong>vaccinated<\/strong> animals, because natural antibodies cannot be differentiated from vaccine antibodies.<\/p>\n<p style=\"text-align: left;\"><strong>ELISA<\/strong> can also be used for disease <strong>monitoring<\/strong>, to assess the <strong>circulation<\/strong> of the pathogen.<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: left;\">Important considerations for diagnosis<\/h2>\n<ol style=\"text-align: left;\">\n<li>\u00a0Send <strong>&gt;1 sample<\/strong><\/li>\n<li>Collect from <strong>different animals<\/strong><\/li>\n<li>Avoid <strong>contamination<\/strong> when collecting the sample<\/li>\n<li>Send <strong>as soon as possible <\/strong>(24 h)<\/li>\n<li>Samples must be <strong>refrigerated or frozen<\/strong><\/li>\n<li><strong>Combine<\/strong> different techniques to increase the chances of detecting pathogens<\/li>\n<li>Use <strong>personal protective<\/strong> equipment (gloves, mask), as many pathogens are zoonotic.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: left;\">Conclusions<\/h2>\n<p style=\"text-align: left;\"><strong>Diagnosis<\/strong> should be made as soon as possible to implement the best control <strong>strategy<\/strong>, such as <a href=\"https:\/\/aboutsmallruminants.com\/fr\/efficacite-vaccin-chlamydia-abortus\/\"><strong>vaccination<\/strong><\/a> of the herd or flock.<\/p>\n<blockquote class=\"pullquote align-center\" style=\"font-size: 20pt;\"><p>Proper sampling and the use of reliable techniques increases the chances of detecting the pathogen<\/p><\/blockquote>\n<p>&nbsp;<\/p>\n<p><strong>Article written by:<\/strong><br \/>\nTania Per\u00e1lvarez Puerta. Global Product Manager, Small Ruminants Franchise \u2013 HIPRA<\/p>\n<p><strong>References:<br \/>\n<\/strong>Chapter 3.7.5 Enzootic abortions of ewes (Ovine Chlamydiosis). Ovine terrestrial Manual 2018<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Transmission of pathogens during milking is the main cause of mastitis in small ruminants. Improper use or malfunction of milking machines is a risk factor for mastitis. In this article we look at the direct effect improper milking can have on teat and udder health. <\/p>\n","protected":false},"author":15,"featured_media":9800,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[88],"class_list":["post-27603","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-reproduction","tag-restricted"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Key points for the diagnosis of \ud835\ude0a. \ud835\ude22\ud835\ude23\ud835\ude30\ud835\ude33\ud835\ude35\ud835\ude36\ud835\ude34: act quickly to effectively control it<\/title>\n<meta name=\"description\" content=\"Small Ruminants | Identifier l\u2019agent causal des avortements chez les brebis et les ch\u00e8vres est essentiel pour mettre en place des mesures de contr\u00f4le efficaces.\" \/>\n<meta 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