Genetic and antigenic characterization data generated at the Worldwide Influenza Centre for viruses with collection dates after 31 January 2023 until 31 August 2023 informed the WHO influenza vaccine composition meeting (VCM) in September 2023 when recommendations were made for the southern hemisphere (SH) 2024 influenza season.
This joint guidance by the ECDC and EMCDDA aims to strengthen the evidence base for developing national strategies for preventing and controlling infections and infectious diseases among people who inject drugs.