{"id":23211,"date":"2024-05-09T03:00:41","date_gmt":"2024-05-08T21:30:41","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=23211"},"modified":"2025-10-04T12:51:32","modified_gmt":"2025-10-04T07:21:32","slug":"widal-test","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/widal-test\/","title":{"rendered":"What is the Widal Test?"},"content":{"rendered":"<h2>About Widal Test:\u00a0<\/h2>\n<ul>\n<li>It is a test done for <strong>diagnosing typhoid <\/strong>fever<strong>.<\/strong>\n<ul>\n<li>Typhoid fever, also <strong>known asenteric fever,<\/strong> is a <strong>bacterial infection<\/strong> caused by the bacterium <strong>Salmonella Typhi<\/strong>, and it is commonly <strong>spread through contaminated food or water.\u00a0<\/strong><\/li>\n<li>A person with typhoid fever will experience symptoms like fatigue, high fever, headache, diarrhoea or constipation, abdominal pain, weight loss, and red spots.<\/li>\n<li>These <strong>symptoms mimic those of malaria, dengue, influenza<\/strong>, and typhus, to name a few, <strong>making it difficult to diagnose<\/strong> without proper testing.<\/li>\n<\/ul>\n<\/li>\n<li>As with other infections, our <strong>immune system produces antibodies<\/strong> in the blood against the bacteria, causing enteric fever.\u00a0<\/li>\n<li>The widal test is a <strong>serological test<\/strong> that <strong>detects antibodies<\/strong> against the bacteria <strong>in a patient\u2019s blood sample<\/strong>, indicating whether or not they have been infected with the bacteria.\u00a0<\/li>\n<li>It is used to <strong>help diagnose a current or recent infectionor<\/strong> to <strong>determine if an individual<\/strong> has <strong>had a previous typhoid infection<\/strong>.<\/li>\n<li>It\u2019s a <strong>point-of-care test<\/strong> and doesn\u2019t need special skills or infrastructure.<\/li>\n<li>Developed in the late 1800s by a French physician, it is <strong>no longer used in many countries<\/strong> because of its flaws.The <a href=\"https:\/\/vajiramandravi.com\/upsc-exam\/world-health-organisation\/\" target=\"_blank\">World Health Organization<\/a> (<strong>WHO)has said<\/strong> that due to the various factors that can influence the results of a Widal test, it is <strong>best not to rely too much on this test.<\/strong><\/li>\n<li><strong>Limitations:<\/strong>\n<ul>\n<li>A <strong>single positive <\/strong>Widal test <strong>report doesn\u2019t<\/strong> necessarily <strong>mean a typhoid infection<\/strong> is present, and a <strong>negative report doesn\u2019t confirm the disease\u2019s absence<\/strong>.<\/li>\n<li><strong>To diagnose an active infection<\/strong>, clinicians <strong>must test at least two serum samples<\/strong> taken <strong>at least 7-14 days apart<\/strong>, so that they may detect a change in the concentrations of the antibodies. But getting two samples is <strong>rarely feasible and time-consuming.<\/strong><\/li>\n<li><strong>In areas with a<\/strong> high and <strong>continuous typhoid burden<\/strong>, <strong>certain levels of antibodies<\/strong> against the bacteria <strong>may already be present<\/strong> in the blood. Without knowing the baseline cut-off, it isn\u2019t possible to correctly interpret the test.<\/li>\n<li>The <strong>reagents used<\/strong> in the Widal test to reveal the presence of various antibodies <strong>can cross-react with antibodies produced against infections by other <\/strong><a href=\"https:\/\/vajiramandravi.com\/upsc-exam\/bacteria\/#:~:text=Quest%20for%20UPSC%20CSE%20Panels&amp;text=Bacteria%20are%20microscopic%20single%2Dcelled,deeper%20trenches%20in%20the%20oceans.\" target=\"_blank\">bacteria<\/a>, <a href=\"https:\/\/vajiramandravi.com\/upsc-exam\/virus\/\" target=\"_blank\">viruses<\/a> or parasites, or even in typhoid-vaccinated individuals, <strong>leading to false positives.<\/strong><\/li>\n<li><strong>Prior antibiotic therapy<\/strong> can <strong>also affect antibody levels<\/strong> and yield a false negative.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>Q1: What is the World Health Organization (WHO)?<\/h3>\n<p>It is a specialized agency of the United Nations which was established in 1948, that connects nations, partners and people to promote health, keep the world safe and serve the vulnerable \u2013 so everyone, everywhere can attain the highest level of health.<\/p>\n<p><strong>Source: <\/strong><a href=\"https:\/\/www.thehindu.com\/sci-tech\/science\/widal-test-overuse-typhoid-antimicrobial-resistance-health-expenses\/article68152863.ece\" target=\"_blank\" rel=\"nofollow noopener\">How the Widal test is clouding India\u2019s sense of its typhoid problem | Explained<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Widal Test is a test done for diagnosing typhoid fever. <\/p>\n","protected":false},"author":5,"featured_media":23212,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-23211","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/23211","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=23211"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/23211\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/23212"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=23211"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=23211"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=23211"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}