{"id":2134,"date":"2022-08-04T17:01:56","date_gmt":"2022-08-04T05:01:56","guid":{"rendered":"https:\/\/www.awanuilabs.co.nz\/south\/otagosouthland\/?page_id=2134"},"modified":"2022-08-04T17:01:57","modified_gmt":"2022-08-04T05:01:57","slug":"pertussis","status":"publish","type":"page","link":"https:\/\/www.awanuilabs.co.nz\/south\/otagosouthland\/referrers\/microbiology-resources\/how-do-i-diagnose\/pertussis\/","title":{"rendered":"Pertussis"},"content":{"rendered":"\n<p><strong>Infection:<\/strong>  Pertussis; whooping cough, <em>Bordetella<\/em> <em>pertussis<\/em> infection<\/p>\n\n\n\n<div class=\"wp-block-atomic-blocks-ab-accordion ab-block-accordion\"><details><summary class=\"ab-accordion-title\">Brief description:<\/summary><div class=\"ab-accordion-text\">\n<ul><li>Highly infectious respiratory infection. Epidemics occur around every 3-5 years.<\/li><li>Can cause severe disease in infants &lt;6 months old or children with chronic cardiac or respiratory illness.<\/li><li>In the early stages resembles a viral URTI, which precedes the development of the typical coughing episodes.<\/li><li>People are regarded as infectious for 21 days from onset of cough.<\/li><\/ul>\n<\/div><\/details><\/div>\n\n\n\n<div class=\"wp-block-atomic-blocks-ab-accordion ab-block-accordion\"><details><summary class=\"ab-accordion-title\">Did you know?<\/summary><div class=\"ab-accordion-text\">\n<p>Antibiotic therapy is recommended within the first three weeks of symptoms, mostly to reduce the period of infectivity. It may alter the natural course of the illness if given within the first week, but not if given after that.<\/p>\n<\/div><\/details><\/div>\n\n\n\n<div class=\"wp-block-atomic-blocks-ab-accordion ab-block-accordion\"><details><summary class=\"ab-accordion-title\">Who should I test?<\/summary><div class=\"ab-accordion-text\">\n<p>Testing is recommended in those with symptoms consistent with pertussis who have been unwell for &lt;4 weeks. Beyond this time the sensitivity of the test is poor and is not recommended.<\/p>\n<\/div><\/details><\/div>\n\n\n\n<div class=\"wp-block-atomic-blocks-ab-accordion ab-block-accordion\"><details><summary class=\"ab-accordion-title\">Test of choice:<\/summary><div class=\"ab-accordion-text\">\n<p>Request <strong><a href=\"https:\/\/scg.aphg.co.nz\/#!\/WEL\/details\/BPD\">Pertussis PCR<\/a><\/strong><\/p>\n\n\n\n<p><strong>PCR<\/strong> on <strong>nasopharyngeal<\/strong> <strong>swab<\/strong><\/p>\n\n\n\n<ul><li>Uncertain <strong>sensitivity<\/strong> &#8211; a negative result <strong>doesn\u2019t exclude<\/strong> infection, especially if there is a high degree of clinical  suspicion. Sensitivity is highest early on in infection.<\/li><li>Good <strong>specificity<\/strong> &#8211; a positive result makes the diagnosis<strong> highly likely <\/strong>in someone with a compatible illness. Occasionally, other <em>Bordetella<\/em> species can cause positive results.<\/li><\/ul>\n<\/div><\/details><\/div>\n\n\n\n<div class=\"wp-block-atomic-blocks-ab-accordion ab-block-accordion\"><details><summary class=\"ab-accordion-title\">Tests to avoid\/specialist tests:<\/summary><div class=\"ab-accordion-text\">\n<p><strong><a href=\"https:\/\/scg.aphg.co.nz\/#!\/WEL\/details\/PER\">Serology<\/a><\/strong><\/p>\n\n\n\n<ul><li>We do not recommend serology for pertussis, as interpretation of results can be confounded by prior vaccination or infection.<\/li><li>The <strong>positive predictive value<\/strong> of a positive serology test in a patient with a chronic cough is generally <strong>not high enough to exclude<\/strong> other more important causes.<\/li><\/ul>\n<\/div><\/details><\/div>\n\n\n\n<div class=\"wp-block-atomic-blocks-ab-accordion ab-block-accordion\"><details><summary class=\"ab-accordion-title\">Other considerations:<\/summary><div class=\"ab-accordion-text\">\n<p>Suspected pertussis infection should be notified immediately to Public Health.<\/p>\n<\/div><\/details><\/div>\n","protected":false},"excerpt":{"rendered":"Infection: Pertussis; 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