{"id":2131,"date":"2022-08-04T17:01:01","date_gmt":"2022-08-04T05:01:01","guid":{"rendered":"https:\/\/www.awanuilabs.co.nz\/south\/otagosouthland\/?page_id=2131"},"modified":"2022-08-04T17:01:02","modified_gmt":"2022-08-04T05:01:02","slug":"parvovirus","status":"publish","type":"page","link":"https:\/\/www.awanuilabs.co.nz\/south\/otagosouthland\/referrers\/microbiology-resources\/how-do-i-diagnose\/parvovirus\/","title":{"rendered":"Parvovirus"},"content":{"rendered":"\n<p><strong>Infection:<\/strong> Parvovirus B19 infection; slapped cheek; Fifth disease; erythema infectiosum<\/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>Common childhood virus that usually causes a benign, self-limiting infection.<\/li><li>Often asymptomatic, but can present with non-specific flu-like illness, rash illness (\u2018slapped cheek\u2019), or arthralgias (more common in adults).<\/li><li>Can cause serious infection in those with chronic haemolytic disorders, severe immune compromise, or serious congenital infection in non-immune pregnant women. If fetal infection occurs, can cause \u2018hydrops fetalis\u2019. Doesn\u2019t cause other types of fetal abnormalities.<\/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>Infection reduces\/halts red blood cell production until immune response. In healthy people this doesn\u2019t cause any problems, but in those with shortened red cell lifespan e.g. chronic haemolysis, can cause severe anaemia.<\/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>Laboratory confirmation of infection <strong>not required<\/strong> for the vast majority of cases.<\/p>\n\n\n\n<ul><li><strong>Seek specialist advice<\/strong> if suspected infection in people with <strong>haematologic<\/strong> <strong>disorders<\/strong> or <strong>severe<\/strong> <strong>immune<\/strong> <strong>compromise<\/strong>.<\/li><li>Test <strong>pregnant<\/strong> <strong>women<\/strong> with possible <strong>symptoms<\/strong> of parvovirus infection.<\/li><li>Test for <strong>immunity<\/strong> in pregnant women with possible <strong>exposure<\/strong> to parvovirus.<\/li><li><strong>Seek specialist advice<\/strong> if suspected <strong>congenital<\/strong> infection (<strong>hydrops<\/strong> on USS). Polyhydramnios or other abnormalities without features of hydrops are <strong>not usually indications for testing<\/strong>.<\/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\">Test of choice:<\/summary><div class=\"ab-accordion-text\">\n<p>Request <strong><a href=\"https:\/\/scg.aphg.co.nz\/#!\/WEL\/details\/PAV\">Parvovirus serology<\/a><\/strong><\/p>\n\n\n\n<p><strong>Parvovirus IgM <\/strong>is a marker of <strong>primary<\/strong> <strong>(acute) infection<\/strong>. Usually detectable <strong>at onset<\/strong> of symptoms. May persist for several months.<\/p>\n\n\n\n<ul><li>Reasonable<strong> sensitivity &#8211; <\/strong>a<strong> negative <\/strong>result makes the diagnosis<strong> unlikely<\/strong>.<\/li><li>Reasonable <strong>specificity<\/strong>&nbsp;&#8211; a <strong>positive<\/strong> result <strong>supports<\/strong>, but doesn\u2019t confirm infection.<\/li><\/ul>\n\n\n\n<p><strong>Parvovirus IgG<\/strong> indicates infection <strong>at some point in time<\/strong> (can be acute <strong>or<\/strong> past infection). Usually appears <strong>within a few days<\/strong> of symptoms.<\/p>\n\n\n\n<ul><li>Excellent<strong> sensitivity &#8211; <\/strong>a<strong> negative <\/strong>result<strong> excludes <\/strong>infection if more than a few days of symptoms.<\/li><li>Excellent <strong>specificity<\/strong>&nbsp; &#8211; a <strong>positive<\/strong> result <strong>confirms<\/strong> infection at some stage.<ul><li>Infers <strong>immunity<\/strong> in a <strong>pregnant<\/strong> <strong>woman<\/strong> tested <strong>within a few days<\/strong> of exposure to possible parvovirus.<\/li><\/ul><\/li><li>Conversion from <strong>negative<\/strong> to <strong>positive<\/strong> <strong>IgG<\/strong> confirms acute infection during the intervening period.<\/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><a href=\"https:\/\/scg.aphg.co.nz\/#!\/WEL\/details\/PVD\"><strong>Parvovirus<\/strong> <strong>PCR<\/strong><\/a> is reserved for specialist use, e.g.:<\/p>\n\n\n\n<ul><li>Diagnosis of infection in <strong>severe immune compromise<\/strong> \u2013 antibody tests less reliable.<\/li><li>Confirmation of infection in certain situations where serology is inconclusive.<\/li><\/ul>\n<\/div><\/details><\/div>\n","protected":false},"excerpt":{"rendered":"Infection: Parvovirus B19 infection; 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