{"id":4073,"date":"2025-05-20T10:33:00","date_gmt":"2025-05-20T10:33:00","guid":{"rendered":"https:\/\/scientificworld.org\/?p=4073"},"modified":"2025-05-20T10:33:04","modified_gmt":"2025-05-20T10:33:04","slug":"single-spillover-event-triggered-h5n1-outbreak-in-u-s-dairy-cattle","status":"publish","type":"post","link":"https:\/\/scientificworld.org\/?p=4073","title":{"rendered":"Single Spillover Event Triggered H5N1 Outbreak in U.S. Dairy Cattle"},"content":{"rendered":"\n<p>A single spillover of the highly pathogenic avian influenza (HPAI) H5N1 virus from wild birds to dairy cattle in Texas likely sparked a multi-state outbreak in 2023, according to new research. The study, led by Thao-Quyen Nguyen and colleagues, in <a href=\"http:\/\/dx.doi.org\/10.1126\/science.adq0900\">Science<\/a>, highlights how the virus spread undetected among cows for months before jumping to other species, raising concerns about pandemic risks as the pathogen evolves to infect mammals more efficiently.<\/p>\n\n\n\n<p>The H5N1 strain, clade 2.3.4.4b, first detected in North America in late 2021, has caused widespread outbreaks in wild birds, poultry, and occasionally humans. In 2024, it unexpectedly appeared in dairy cattle across several U.S. states, prompting an investigation into its origins. By analyzing genetic data from over 100 viral variants and sequencing new genomes from infected cattle, researchers traced the outbreak to a single avian-to-cow transmission in mid-to-late 2023.<\/p>\n\n\n\n<p>The virus then spread silently among cattle for months, aided by the movement of infected or presymptomatic animals. This led to outbreaks in states like North Carolina, Idaho, and Michigan. Alarmingly, the virus also jumped back to poultry and other mammals, including raccoons, cats, and wild birds. Genetic analysis revealed mutations linked to mammalian adaptation, some of which are now permanent in the viral population.<\/p>\n\n\n\n<p>Dr. Thao-Quyen Nguyen, the study\u2019s lead author, emphasized the broader implications: \u201cOur findings show that influenza A virus is a transboundary pathogen requiring coordinated efforts across animal and public health sectors to mitigate pandemic risks.\u201d<\/p>\n\n\n\n<p>The study underscores the urgent need for enhanced surveillance and cross-species monitoring to track H5N1\u2019s evolution. As the virus gains footholds in new hosts, proactive measures are critical to safeguard animal and human health while preventing further spread.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A single spillover of the highly pathogenic avian influenza (HPAI) H5N1 virus from wild birds to dairy cattle in Texas likely sparked a multi-state outbreak in 2023, according to new research. The study, led by Thao-Quyen Nguyen and colleagues, in Science, highlights how the virus spread undetected among cows for months before jumping to other [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1565],"tags":[1777,1566],"class_list":["post-4073","post","type-post","status-publish","format-standard","hentry","category-health-medicine","tag-cattle","tag-health-medicine"],"_links":{"self":[{"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/posts\/4073","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/scientificworld.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4073"}],"version-history":[{"count":1,"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/posts\/4073\/revisions"}],"predecessor-version":[{"id":4074,"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/posts\/4073\/revisions\/4074"}],"wp:attachment":[{"href":"https:\/\/scientificworld.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4073"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/scientificworld.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4073"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/scientificworld.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}