Since 2003, H5N1 influenza viruses have circulated in 23 countries, primarily affecting wild birds and poultry resulting in nearly 900 reported human cases, primarily among people who have had close contact with infected birds. In the past few years, however, a highly pathogenic avian influenza virus called HPAI H5N1 has spread to infect more than 50 animal species.
In late March 2024, an HPAI H5N1 outbreak was reported among dairy cows in Texas. Although the virus so far has not shown genetic evidence of acquiring the ability to spread from person-to-person, public health officials are closely monitoring the outbreak as part of overarching pandemic preparedness efforts.
The NIAID H5N1 research agenda builds on the Institute’s longstanding influenza research efforts. It addresses the current outbreak in U.S. dairy cows including potential human-to-human transmission of H5N1 influenza viruses. NIAID will leverage both its domestic and international research infrastructures to achieve the plan’s objectives.
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