Background
Seasonal influenza (‘the flu’) is an acute respiratory infection caused by influenza viruses that circulate globally and year-round. It can cause illness ranging from mild to severe, sometimes resulting in hospitalization or death. Increased seasonal influenza activity was reported globally in recent months, coinciding with the onset of winter in the northern hemisphere and an increase in acute respiratory infections caused by influenza and other respiratory viruses typically observed at this time of year. Seasonal influenza viruses, including A(H3N2) viruses, continually evolve over time. Since August 2025, a rapid increase of A(H3N2) J.2.4.1 alias K subclade viruses was detected from several countries based on available genetic sequence data. Early estimates suggest that the influenza vaccine continues to provide protection against hospital attendance in both children and adults, even though its effectiveness against clinical disease during the current season remains uncertain. Vaccines remain essential, especially for people at high risk of influenza complications and their care givers. WHO coordinates global surveillance of influenza, which remains a major public health threat. Timely monitoring of virus activity and its evolution help WHO guide countries in preparedness planning, vaccine policy, and resource allocation.
Objectives
The webinar aims to provide a global update on influenza situation, with a focus on the northern hemisphere winter season and the evolution of seasonal viruses
Tentative Agenda and Speakers
Introduction: EPI-WIN Science and Knowledge Translation, WHO
Welcome remarks: Dr Maria Van Kerkhove, Director a.i., Department of Epidemic and Pandemic Management (EPM), WHO Health Emergencies Programme (WHE) - (TBC)
Global update on seasonal influenza virus activity: Dr Aspen Hammond, Technical Officer, Global Influenza Programme, WHO
Current influenza season in northern hemisphere – experience from the United Kingdom:
Professor Maria Zambon, Director of the National Influenza Centre, UK Health Security Agency (UKHSA)
Past influenza season in the southern hemisphere – anything usual, and why?: Professor Ian Barr, Deputy Director, WHO Collaborating Centre for Influenza, Australia
Q&A: Moderator: Dr Wenqing Zhang, Head, Global Respiratory Threats, EPM, WHO
Closing remarks and next steps: Dr Supriya Bezbaruah, Lead, EPI-WIN Science and Knowledge Translation, WHO
Registration: