Article
Scientific Papers
Human monoclonal antibodies that target clade 2.3.4.4b H5N1 hemagglutinin
The highly pathogenic avian influenza H5N1 virus clade 2.3.4.4b has been spreading globally since 2022, causing mortality and morbidity in domestic and wild birds, as well as in mammals, which underscores its potential to cause a pandemic.
Pandemic security needs national leadership
In a world facing escalating risks from conflict, climate change, and emerging infectious diseases, health systems are the first line of defense for protecting people, economies, and stability.
Pre-existing cross-reactive immunity to highly pathogenic avian influenza 2.3.4.4b A(H5N1) virus in the United States
The unprecedented 2.3.4.4b. A(H5N1) outbreak in dairy cattle, poultry, and spillover to humans in the United States (US) poses a major public health threat.
Avian Influenza A(H5N5) - United States of America
Situation at a glance On 15 November 2025, WHO was notified of the 71st confirmed human case with influenza A(H5) since early 2024 in the United States of America— the first human case reported in the United States of America since February 2025.