{"id":2159,"date":"2022-08-04T17:11:36","date_gmt":"2022-08-04T05:11:36","guid":{"rendered":"https:\/\/www.awanuilabs.co.nz\/south\/otagosouthland\/?page_id=2159"},"modified":"2022-08-04T17:11:36","modified_gmt":"2022-08-04T05:11:36","slug":"congenital-parvovirus-b19-infection","status":"publish","type":"page","link":"https:\/\/www.awanuilabs.co.nz\/south\/otagosouthland\/referrers\/microbiology-resources\/how-do-i-diagnose\/congenital-parvovirus-b19-infection\/","title":{"rendered":"Congenital parvovirus B19 infection"},"content":{"rendered":"\n<p><strong>Infection:<\/strong> Congenital parvovirus B19 infection<\/p>\n\n\n\n<p>Also refer to:\u00a0<a href=\"https:\/\/www.awanuilabs.co.nz\/south\/otagosouthland\/referrers\/microbiology-resources\/how-do-i-diagnose\/parvovirus\/\">How do I diagnose \u2013 Parvovirus<\/a><\/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 illness, often associated with a rash, or \u2018slapped-cheek\u2019 appearance.<\/li><li>Is a fetal risk if maternal infection occurs prior to 20 weeks gestation:<ul><li>~10% excess risk of fetal death<\/li><li>~3% risk of hydrops fetalis if maternal infection between 9-20 weeks<\/li><\/ul><\/li><li>Unlike other congenital infections, which can cause a wide range of abnormalities, parvovirus is associated specifically with hydrops fetalis.<ul><li>Does not appear to be associated with long-term developmental sequelae in those that don\u2019t develop hydrops.<\/li><\/ul><\/li><li>Treatment is available for hydrops, which can significantly improve survival.<\/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>Parvovirus infects red blood cell precursors. If fetal infection occurs this can result in fetal anaemia, which is what causes hydrops.<\/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\">Diagnostic approach:<\/summary><div class=\"ab-accordion-text\">\n<ul><li>Routine screening in pregnant women is not recommended.<\/li><li>Test in pregnant women exposed to possible parvovirus infection.<\/li><li>Test in pregnant women with features of possible hydrops fetalis on USS.<ul><li>Parovirus testing is not recommended as part of testing if other possible congenital abnormalities are seen, as it is specifically associated with hydrops (and occasionally transient pleural or pericardial effusions).<\/li><li>Testing not recommended if isolated polyhydramnios.<\/li><\/ul><\/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: Maternal exposure to parvovirus during pregnancy (e.g. child with \u2018slapped cheek\u2019)<\/summary><div class=\"ab-accordion-text\">\n<p><strong>Asymptomatic<\/strong> and <strong>within one week<\/strong> of exposure:<\/p>\n\n\n\n<ul><li>Request \u201c<strong><a href=\"https:\/\/scg.aphg.co.nz\/#!\/WEL\/details\/PAV\">Parvovirus serology<\/a>\u201d <\/strong>and note date of exposure on lab form<ul><li>Parvovirus <strong>IgG<\/strong> <strong>positive<\/strong><ul><li>Evidence of <strong>immunity.<\/strong><\/li><li>No further action required.<\/li><\/ul><\/li><li>Parvovirus <strong>IgG<\/strong> <strong>negative<\/strong><ul><li><strong>Susceptible<\/strong> to infection.<\/li><li>Repeat parvovirus serology in <strong>4 weeks<\/strong> or if <strong>symptoms<\/strong> develop to look for seroconversion.<\/li><\/ul><\/li><\/ul><\/li><\/ul>\n\n\n\n<p><strong>Symptomatic<\/strong>:<\/p>\n\n\n\n<ul><li>Request <strong>\u201c<a href=\"https:\/\/scg.aphg.co.nz\/#!\/WEL\/details\/PAV\">Parvovirus serology<\/a>\u201d<\/strong><ul><li>Parvovirus <strong>IgM &amp; IgG positive<\/strong><ul><li>Suggestive of <strong>acute infection<\/strong>.<\/li><li>Refer to <strong>maternal fetal medicine<\/strong> specialist.<\/li><\/ul><\/li><li>Parvovirus <strong>IgM positive, IgG negative<\/strong><ul><li>Possible <strong>early acute<\/strong> infection.<\/li><li>Repeat serology in <strong>2 weeks<\/strong> to look for IgG seroconversion (confirms acute infection).<\/li><\/ul><\/li><li>Parvovirus <strong>IgM &amp; IgG negative<\/strong><ul><li>No evidence of parvovirus being cause of symptoms.<\/li><li>Repeat serology <strong>4 weeks after exposure<\/strong>.<\/li><\/ul><\/li><\/ul><\/li><\/ul>\n\n\n\n<ul><li>Parvovirus <strong>IgM negative<\/strong>, <strong>IgG positive<\/strong><ul><li>Probable <strong>past infection\/immunity.<\/strong><\/li><li>A small proportion of people <strong>do not mount a detectable IgM<\/strong> response. If there was a clear history of exposure and suggestive symptoms, discuss with <strong>clinical microbiologist<\/strong> regarding further testing.<ul><li>May include testing of <strong>booking sample<\/strong> to look for seroconversion, or maternal <strong>blood PCR<\/strong>.<\/li><\/ul><\/li><\/ul><\/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: USS findings of hydrops fetalis<\/summary><div class=\"ab-accordion-text\">\n<p><strong>Step 1: <\/strong>confirm maternal infection: request<strong> \u201c<a href=\"https:\/\/scg.aphg.co.nz\/#!\/WEL\/details\/PAV\">Parvovirus serology<\/a>\u201d<\/strong><\/p>\n\n\n\n<ul><li>Parvovirus<strong> IgG negative<\/strong><ul><li><strong>Excludes<\/strong> maternal infection and therefore fetal infection as cause of hydrops.<\/li><li>No further parvovirus testing required.<\/li><\/ul><\/li><\/ul>\n\n\n\n<ul><li>Parvovirus <strong>IgG positive<\/strong><ul><li><strong>Confirms<\/strong> maternal infection <strong>at some stage<\/strong><\/li><li>Continue to step 2. Further testing should be under the guidance of a <strong>maternal fetal medicine<\/strong> specialist.<\/li><\/ul><\/li><\/ul>\n\n\n\n<p><strong>Step 2<\/strong>: if confirmation of fetal infection is required (e.g. to confirm parvovirus as cause of hydrops): <strong>parvovirus PCR<\/strong> on amniotic fluid<\/p>\n\n\n\n<ul><li>Excellent <strong>sensitivity<\/strong> &#8211; a negative result makes parvovirus the cause of hydrops <strong>very unlikely<\/strong><\/li><li>Excellent <strong>specificity<\/strong> &#8211; a positive result <strong>confirms<\/strong> fetal parvovirus infection<\/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>Parvovirus blood PCR<\/strong><\/p>\n\n\n\n<ul><li>Reserved for specialist use, as serology is the first line tool for diagnosis.<\/li><li>Used in certain situations where serology is inconclusive.<\/li><\/ul>\n\n\n\n<p>Parvovirus testing as part of a <strong>\u2018TORCH\u2019 screen<\/strong>, or if <strong>other, non-hydrops, abnormalities<\/strong> seen on antenatal USS<\/p>\n\n\n\n<ul><li>Because parvovirus produces the specific condition of hydrops, it should not be included as part of a general screen if other abnormalities are seen.<\/li><\/ul>\n<\/div><\/details><\/div>\n","protected":false},"excerpt":{"rendered":"Infection: Congenital parvovirus B19 infection Also refer to:\u00a0How do I diagnose \u2013 Parvovirus","protected":false},"author":18,"featured_media":0,"parent":2060,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-left-sidebar.php","meta":{"footnotes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Congenital parvovirus B19 infection &#8212; 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