{"id":175033,"date":"2023-06-04T17:25:59","date_gmt":"2023-06-04T21:25:59","guid":{"rendered":"https:\/\/antiguanewsroom.com\/?p=175033"},"modified":"2023-06-04T17:25:59","modified_gmt":"2023-06-04T21:25:59","slug":"experts-warn-bird-flu-virus-rapidly-changing-in-largest-ever-outbreak","status":"publish","type":"post","link":"https:\/\/antiguanewsroom.com\/experts-warn-bird-flu-virus-rapidly-changing-in-largest-ever-outbreak\/","title":{"rendered":"Experts Warn Bird Flu Virus Rapidly Changing in Largest Ever Outbreak"},"content":{"rendered":"<div id=\"antig-480429081\" class=\"antig-ecab antig-entity-placement\"><a href=\"https:\/\/discoverflow.co\/web\/antigua\" aria-label=\"ANU CVP Digital Broadband 1200x400_1\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1201w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:100\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:342\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:256\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1201\" height=\"401\"   \/><\/a><\/div><div id=\"antig-215726399\" class=\"antig-before-content antig-entity-placement\"><a href=\"https:\/\/www.facebook.com\/medicalbenefitsscheme\" aria-label=\"ce741a73-c70c-446b-af7f-da2abe2b62bb\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1200\/h:400\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/ce741a73-c70c-446b-af7f-da2abe2b62bb.jpeg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1200\/h:400\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/ce741a73-c70c-446b-af7f-da2abe2b62bb.jpeg 1200w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:100\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/ce741a73-c70c-446b-af7f-da2abe2b62bb.jpeg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:341\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/ce741a73-c70c-446b-af7f-da2abe2b62bb.jpeg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:256\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/ce741a73-c70c-446b-af7f-da2abe2b62bb.jpeg 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1200\" height=\"400\"   \/><\/a><\/div><p class=\"article__body\">The virus causing record cases of avian influenza in birds across the world is changing rapidly, experts have warned, as calls increase for countries to vaccinate their poultry.<\/p><div id=\"antig-2243090208\" class=\"antig-content_5 antig-entity-placement\"><a href=\"https:\/\/www.antiguabarbudaculinarymonth.com\/\" aria-label=\"culinary\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:843\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:843\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 2560w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:132\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:450\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:337\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 768w, https:\/\/mlavawteztbj.i.optimole.com\/w:1536\/h:675\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 1536w, https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:842\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 2048w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"2560\" height=\"1124\"   \/><\/a><\/div>\n<div id=\"antig-930778773\" class=\"antig-inside-article-content\"><\/div>\n<p class=\"article__body\">While emphasising that the risk to humans remains low, the experts who spoke to AFP said that the surging number of bird flu cases in mammals was a cause for concern.<\/p>\n<p class=\"article__body\">Since first emerging in 1996, the H5N1 avian influenza virus had previously been confined to mostly seasonal outbreaks.<\/p><div id=\"antig-2319764209\" class=\"antig-content_4 antig-entity-placement\"><a href=\"https:\/\/discoverflow.co\/web\/antigua\" aria-label=\"ANU CVP Digital Broadband 1200x400_1\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1201w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:100\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:342\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:256\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1201\" height=\"401\"   \/><\/a><\/div><div id=\"antig-2933782173\" class=\"antig-content_12 antig-entity-placement\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1320\/h:730\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/02\/IMG_5614.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1320\/h:730\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/02\/IMG_5614.jpg 1320w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:166\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/02\/IMG_5614.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:566\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/02\/IMG_5614.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:425\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/02\/IMG_5614.jpg 768w, https:\/\/mlavawteztbj.i.optimole.com\/w:696\/h:385\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/02\/IMG_5614.jpg 696w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1320\" height=\"730\"   \/><\/div>\n<p class=\"article__body\">But \u201csomething happened\u201d in mid-2021 that made the group of viruses much more infectious, according to Richard Webby, the head of a World Health Organization collaborating centre studying influenza in animals.<\/p><div id=\"antig-2711417409\" class=\"antig-content antig-entity-placement\"><a href=\"https:\/\/www.antiguabarbudaculinarymonth.com\/\" aria-label=\"culinary\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:843\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:843\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 2560w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:132\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:450\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:337\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 768w, https:\/\/mlavawteztbj.i.optimole.com\/w:1536\/h:675\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 1536w, https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:842\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/04\/culinary-scaled.jpg 2048w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"2560\" height=\"1124\"   \/><\/a><\/div>\n<p class=\"article__body\">Since then, outbreaks have lasted all year round, spreading to new areas and leading to mass deaths among wild birds and tens of millions of poultry being culled.<\/p>\n<p class=\"article__body\">Webby, who is a researcher at St Jude Children\u2019s Research Hospital in the US city of Memphis, told AFP it was \u201cabsolutely\u201d the largest outbreak of avian influenza the world had seen<\/p><div id=\"antig-2595797278\" class=\"antig-content_2 antig-entity-placement\"><a href=\"https:\/\/www.courts.com\/antigua\/\" aria-label=\"IMG_0783\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:500\/h:500\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2021\/03\/IMG_0783.png\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:500\/h:500\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2021\/03\/IMG_0783.png 500w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:300\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2021\/03\/IMG_0783.png 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:150\/h:150\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2021\/03\/IMG_0783.png 150w\" sizes=\"(max-width: 500px) 100vw, 500px\" width=\"500\" height=\"500\"   \/><\/a><\/div>\n<p class=\"article__body\">He led research, published this week in the journal Nature Communications, showing how the virus rapidly evolved as it spread from Europe into North America.<\/p>\n<p class=\"article__body\">The study said the virus increased in virulence, which means it causes more dangerous disease, when in arrived in North America.<\/p><div id=\"antig-898227400\" class=\"antig-content_3 antig-entity-placement\"><a href=\"https:\/\/www.courts.com\/antigua\/\" aria-label=\"IMG_1115\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:864\/h:1080\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2021\/04\/IMG_1115.jpeg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:864\/h:1080\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2021\/04\/IMG_1115.jpeg 1080w, https:\/\/mlavawteztbj.i.optimole.com\/w:240\/h:300\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2021\/04\/IMG_1115.jpeg 240w, https:\/\/mlavawteztbj.i.optimole.com\/w:819\/h:1024\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2021\/04\/IMG_1115.jpeg 819w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:960\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2021\/04\/IMG_1115.jpeg 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1080\" height=\"1350\"   \/><\/a><\/div>\n<p class=\"article__body\">The researchers also infected a ferret with one of the new strains of bird flu.<\/p><div id=\"antig-1547898502\" class=\"antig-content_6 antig-entity-placement\"><a href=\"https:\/\/discoverflow.co\/web\/antigua\" aria-label=\"ANU CVP Digital Broadband 1200x400_1\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1201w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:100\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:342\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:256\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1201\" height=\"401\"   \/><\/a><\/div>\n<p class=\"article__body\">The found an unexpectedly \u201chuge\u201d amount of the virus in its brain, Webby said, indicating it had caused more serious disease than previous strains.<\/p>\n<p class=\"article__body\">Emphasising that the risk in humans was still low, he said that \u201cthis virus is not being static, it\u2019s changing\u201d.<\/p>\n<p class=\"article__body\">\u201cThat does increase the potential that even just by chance\u201d the virus could \u201cpick up genetic traits that allow it to be more of a human virus,\u201d he said.<\/p>\n<p class=\"article__body\">In rare cases, humans have contracted the sometimes deadly virus, usually after coming in close contact with infected birds.<\/p>\n<h2 class=\"article__body\"><strong id=\"strong-9f735e0c3c53120436893b93fe11f3cc\">\u2013 \u2018Scares us\u2019 \u2013<\/strong><\/h2>\n<p class=\"article__body\">The virus has also been detected in a soaring number of mammals, which Webby described as a \u201creally, really troubling sign\u201d.<\/p>\n<p class=\"article__body\">Last week Chile said that nearly 9,000 sea lions, penguins, otters, porpoises and dolphins have died from bird flu along its north coast since the start of the year.<\/p>\n<p class=\"article__body\">Most mammals are believed to have contracted the virus by eating an infected bird.<\/p>\n<p class=\"article__body\">But Webby said that what \u201cscares us the most\u201d are indications from a Spanish mink farm, or among sea lions off South America, that the virus could be transmitting between mammals.<\/p>\n<p class=\"article__body\">Ian Brown, virology head at the UK\u2019s Animal and Plant Health Agency, said there has not yet been \u201cclear evidence that this virus is easily sustaining in mammals.\u201d<\/p>\n<p class=\"article__body\">While the virus is changing to become \u201cmore efficient and more effective in birds,\u201d it remains \u201cunadapted to humans,\u201d Brown told AFP.<\/p>\n<p class=\"article__body\">Avian viruses bind to different receptors on the host cell than human viruses, Webby said.<\/p>\n<p class=\"article__body\">It would take \u201ctwo or three minor changes in one protein of the viruses\u201d to become more adapted to humans, he said.<\/p>\n<p class=\"article__body\">\u201cThat is what we\u2019re really looking out for.\u201d<\/p>\n<h2 class=\"article__body\"><strong id=\"strong-78216a550680481729e8a74aecc4f459\">\u2013 Vaccinating poultry \u2013<\/strong><\/h2>\n<p class=\"article__body\">One way to bring down the number of total bird flu cases, and therefore reduce the risk to humans, would be for countries to vaccinate their poultry, Webby said.<\/p>\n<p class=\"article__body\">A few nations including China, Egypt and Vietnam have already held vaccination campaigns for poultry.<\/p>\n<p class=\"article__body\">But many other countries have been reluctant due to import restrictions in some areas, and fears vaccinated birds that nonetheless get infected could slip through the net.<\/p>\n<p class=\"article__body\">In April, the United States started testing several vaccine candidates for potential use on birds.<\/p>\n<p class=\"article__body\">France recently said it hopes to start vaccinating poultry as early as autumn this year.<\/p>\n<p class=\"article__body\">Christine Middlemiss, the UK\u2019s chief veterinary officer, said that vaccinating poultry was not \u201ca silver bullet because the virus changes constantly\u201d.<\/p>\n<p class=\"article__body\">But traditionally reluctant countries should consider vaccinating poultry more often, Middlemiss told AFP at an event at the UK\u2019s embassy in Paris last week.<\/p>\n<p class=\"article__body\">World Organisation for Animal Health director general Monique Eloit said that the issue of vaccinating poultry should be \u201con the table\u201d.<\/p>\n<p class=\"article__body\">After all, \u201ceveryone now knows that a pandemic is not just a fantasy \u2014 it could be a reality,\u201d she added.<\/p>\n<p>Source: AFP<\/p>\n<div id=\"antig-2246430802\" class=\"antig-in-comments_2 antig-entity-placement\"><a href=\"https:\/\/www.facebook.com\/@hadeedmotorsltd\" aria-label=\"Hadeed_WEB_Banner_MG-2\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1000\/h:250\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/Hadeed_WEB_Banner_MG-2.png\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1000\/h:250\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/Hadeed_WEB_Banner_MG-2.png 1000w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:75\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/Hadeed_WEB_Banner_MG-2.png 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:192\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/Hadeed_WEB_Banner_MG-2.png 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1000\" height=\"250\"   \/><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>The virus causing record cases of avian influenza in birds across the world is changing rapidly, experts have warned, as calls increase for countries to vaccinate their poultry. While emphasising that the risk to humans remains low, the experts who spoke to AFP said that the surging number of bird flu cases in mammals was [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":141137,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-175033","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-regional"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.1 (Yoast SEO v24.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Experts Warn Bird Flu Virus Rapidly Changing in Largest Ever Outbreak - Antigua News Room<\/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:\/\/antiguanewsroom.com\/experts-warn-bird-flu-virus-rapidly-changing-in-largest-ever-outbreak\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Experts Warn Bird Flu Virus Rapidly Changing in Largest Ever Outbreak\" \/>\n<meta property=\"og:description\" content=\"The virus causing record cases of avian influenza in birds across the world is changing rapidly, experts have warned, as calls increase for countries to vaccinate their poultry. 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