{"id":143,"date":"2014-07-09T15:10:37","date_gmt":"2014-07-09T14:10:37","guid":{"rendered":"http:\/\/default.flucentrenet.studioplum.prvw.eu\/?p=143"},"modified":"2015-12-04T17:12:47","modified_gmt":"2015-12-04T17:12:47","slug":"viruses-for-the-vaccine","status":"publish","type":"post","link":"https:\/\/eswiwp.akapivo.site\/knowledge-center\/viruses-for-the-vaccine\/","title":{"rendered":"Viruses for the vaccine"},"content":{"rendered":"<p>Each year, the seasonal influenza viruses change slightly which leads to a less perfect match between the vaccine viruses and the circulating viruses, rendering the vaccine used in previous years less effective. Therefore, each year, a new vaccine must be prepared that will be effective against the influenza virus strains that are expected to circulate in the next season. On the other hand, the vaccine takes about six months to manufacture, so the formula for the vaccine is developed on the basis of viruses that have circulated in the previous season. Hence, there is always a slight chance that the match will be imperfect.<\/p>\n<p>To make the selection, researchers in the WHO\u2019s Global Influenza Surveillance Network study the influenza viruses that are circulating in humans. Based on information collected by the network, the WHO recommends a vaccine that targets these circulating viruses bi-annually \u2014 for the northern and the southern hemispheres. The WHO Collaborating Centres then release suitable prototype viruses or primary seed viruses to the vaccine manufacturers. These viruses carry the H and N proteins of viruses that were originally isolated from humans suffering from influenza.<\/p>\n<div id=\"attachment_4200\" style=\"width: 310px\" class=\"wp-caption aligncenter\"><a class=\"link-to-pdf\" title=\"Strain selection\" href=\"http:\/\/eswiwp.akapivo.site\/knowledge-center\/wp-content\/uploads\/sites\/11\/2015\/12\/12-Science-policy-flu-summit-Derek-Smith.pdf\" target=\"_blank\" rel=\"attachment wp-att-4200\"><img aria-describedby=\"caption-attachment-4200\" loading=\"lazy\" class=\"size-medium wp-image-4201\" src=\"http:\/\/eswiwp.akapivo.site\/knowledge-center\/wp-content\/uploads\/sites\/11\/2015\/12\/12-Science-policy-flu-summit-Derek-Smith-pdf-300x200.jpg\" alt=\"thumbnail of 12- Science-policy-flu-summit-Derek-Smith\" width=\"300\" height=\"200\" srcset=\"https:\/\/eswiwp.akapivo.site\/knowledge-center\/wp-content\/uploads\/sites\/11\/2015\/12\/12-Science-policy-flu-summit-Derek-Smith-pdf-300x200.jpg 300w, https:\/\/eswiwp.akapivo.site\/knowledge-center\/wp-content\/uploads\/sites\/11\/2015\/12\/12-Science-policy-flu-summit-Derek-Smith-pdf-705x470.jpg 705w, https:\/\/eswiwp.akapivo.site\/knowledge-center\/wp-content\/uploads\/sites\/11\/2015\/12\/12-Science-policy-flu-summit-Derek-Smith-pdf-450x300.jpg 450w, https:\/\/eswiwp.akapivo.site\/knowledge-center\/wp-content\/uploads\/sites\/11\/2015\/12\/12-Science-policy-flu-summit-Derek-Smith-pdf-80x53.jpg 80w, https:\/\/eswiwp.akapivo.site\/knowledge-center\/wp-content\/uploads\/sites\/11\/2015\/12\/12-Science-policy-flu-summit-Derek-Smith-pdf.jpg 810w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-4200\" class=\"wp-caption-text\">Strain selection and the evolution of the virus &#8211; Derek Smith (University of Cambridge)<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Each year, the seasonal influenza viruses change slightly which leads to a less perfect match between the vaccine viruses and the circulating viruses, rendering the vaccine used in previous years less effective. Therefore, each year, a new vaccine must be prepared that will be effective against the influenza virus strains that are expected to circulate [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[72],"tags":[60,71],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.7.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Viruses for the vaccine - Knowledge center<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eswiwp.akapivo.site\/knowledge-center\/viruses-for-the-vaccine\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Viruses for the vaccine - Knowledge center\" \/>\n<meta property=\"og:description\" content=\"Each year, the seasonal influenza viruses change slightly which leads to a less perfect match between the vaccine viruses and the circulating viruses, rendering the vaccine used in previous years less effective. 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