This report contains genetic and antigenic characterization data generated at the Worldwide Influenza Centre for viruses with collection dates after 31 January 2023 until 31 August 2023.
This issue of the ECDC Communicable Disease Threats Report (CDTR) covers the period 31 December 2023-6 January 2024 and includes updates on Avian influenza A(H5N6 and H9N2), SARS-CoV-2 variant classification, Western Equine Encephalitis, and an overview of respiratory virus epidemiology in the EU/EEA.