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<div about="/news-events/nih-research-matters/testing-transmission-infection-h5n1-cows" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-research-matters view-mode-full node--full node--nih-research-matters--full clearfix">
<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2024-07-23T00:00:00-04:00" class="date-display-single">July 23, 2024</span></p><div class='syndicate'><h1>Testing transmission and infection of H5N1 from cows</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
<ul>
<li>Researchers found that an H5N1 flu virus from cows could infect mice and ferrets, but airborne transmission wasnt very efficient.</li>
<li>The findings increase our understanding of whether the H5N1 outbreak in cows could lead to a human pandemic.</li>
</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
<picture title="Black and white Holstein dairy cows sticking their heads through a stall fence and eating hay while a farmer carries a jug of milk in the background.">
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/news-releases/2024/AdobeStock_751006536.jpeg?itok=TtjIRTPv&amp;timestamp=1721675886" alt="Black and white Holstein dairy cows sticking their heads through a stall fence and eating hay while a farmer carries a jug of milk in the background." title="Black and white Holstein dairy cows sticking their heads through a stall fence and eating hay while a farmer carries a jug of milk in the background." />
</picture><span class="caption">Scientists are studying the H5N1 influenza virus that has been causing an outbreak in U.S. cattle to see how much of a threat it might pose to public health. </span><span class="credit">JackF / Adobe Stock</span></div>
</div><p>Highly pathogenic H5N1 influenza viruses spread mostly among birds, but occasional infections in mammals do occur. The first documented outbreak of H5N1 in cattle occurred in the United States in spring 2024. During this outbreak, the virus has spread within and between cattle herds. In addition to poultry, cats and people have also been infected. If the virus spread through the human population, it could pose a great risk to public health. Yet how the cow H5N1 virus transmits between mammals isnt well understood.</p>
<p>A research team led by Dr. Yoshihiro Kawaoka at the University of WisconsinMadison studied an H5N1 virus isolated from the milk of an infected cow in New Mexico. Using mice and ferrets as models, the researchers examined how the virus spread within the body and between individuals. Results from the study, which was funded in part by NIH, appeared in <em>Nature </em>on July 8, 2024.</p>
<p>The team found that mice became infected with the virus after consuming unpasteurized milk from an infected cow. Both mice and ferrets could also be infected through the nose. In both animals, the virus then spread to organs and tissues beyond the respiratory system. These included mammary glands and muscle. A comparison H5N1 virus, typical of those that have infected humans before, spread to the same tissues.</p>
<p>Because the team found virus in mammary glands, they tested whether it could spread from mother to offspring via milk. Within a week of infection, the virus was detected in the mammary glands of lactating female mice, and some of their nursing pups became infected. Adult mice housed together with infected females did not get infected, suggesting that the pups were infected via milk.</p>
<p>To test whether the virus can transmit through the air in respiratory droplets, the researchers housed uninfected ferrets in cages next to infected ones. For almost two weeks, the exposed ferrets never developed disease symptoms or had virus detected in nasal swabs. But one out of four exposed ferrets did show an immune system response to the virus, suggesting infection.</p>
<p>Human influenza viruses bind to a structure on the surfaces of cells in the human upper respiratory tract that allows them to enter the cells. Bird influenza viruses, in contrast, usually bind to a different, related structure. But the team found that the cow H5N1 virus could bind to both. This suggests that the virus could infect cells in the human upper respiratory tract.</p>
<p>Taken together, these results suggest that H5N1 in cows can infect other mammals, including humans, via raw milk. But they also suggest that airborne transmission isnt very efficient. Thus, the virus isnt likely to spread this way, limiting its potential to cause a human pandemic. Yet the researchers noted the need for continued vigilance, as viruses can mutate. They can also exchange genetic material with other influenza viruses that may help them spread more easily in humans.</p>
<p>“The H5N1 virus currently circulating in cattle has limited capacity to transmit in mammals,” Kawaoka says. “But we need to monitor and contain this virus to prevent its evolution to one that transmits well in humans.”</p>
<p>—by Brian Doctrow, Ph.D.</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/assessing-avian-influenza-dairy-milk" target="_top">Assessing Avian Influenza in Dairy Milk</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/research-context-progress-toward-universal-vaccines" target="_top">Research in Context: Progress toward universal vaccines</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/using-mrna-technology-universal-flu-vaccine" target="_top">Using mRNA Technology for A Universal Flu Vaccine</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/study-suggests-way-improve-flu-vaccines" target="_top">Study Suggests Way to Improve Flu Vaccines</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/strategy-may-improve-seasonal-flu-vaccines" target="_top">Strategy May Improve Seasonal Flu Vaccines</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/finding-factors-protect-against-flu" target="_top">Finding Factors That Protect Against Flu</a></li><li><a href="https://newsinhealth.nih.gov/2022/01/it-flu-covid-19-allergies-or-cold" target="_top">Is It Flu, COVID-19, Allergies, or a Cold?</a></li><li><a href="https://www.niaid.nih.gov/diseases-conditions/influenza" target="_top">Influenza</a></li><li><a href="https://www.niaid.nih.gov/research/pandemic-preparedness" target="_top">Pandemic Preparedness</a></li><li><a href="https://www.cdc.gov/bird-flu/index.html" target="_top">Avian Influenza (CDC)</a></li></ul><p class="footnote"><strong class="label-inline">References:&nbsp;</strong><a href="https://pubmed.ncbi.nlm.nih.gov/38977017/">Pathogenicity and transmissibility of bovine H5N1 influenza virus.</a> Eisfeld AJ, Biswas A, Guan L, Gu C, Maemura T, Trifkovic S, Wang T, Babujee L, Dahn R, Halfmann PJ, Barnhardt T, Neumann G, Suzuki Y, Thompson A, Swinford AK, Dimitrov KM, Poulsen K, Kawaoka Y. <em>Nature</em>. 2024 Jul 8. doi: 10.1038/s41586-024-07766-6. Online ahead of print. PMID: 38977017.</p><p class="footnote"><strong class="label-inline">Funding:&nbsp;</strong>NIHs National Institute of Allergy and Infectious Diseases (NIAID); Japan Agency for Medical Research and Development; United States Department of Agriculture; Wisconsin Department of Agriculture, Trade, and Consumer Protection.</p>
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