The ECDC Communicable Disease Threats Report (CDTR) is a weekly bulletin for epidemiologists and health professionals on active public health threats. This issue of the CDTR covers the period 13-19 August 2023 and includes updates on avian influenza A(H5N6), avian influenza A(H9N2), West Nile virus, COVID-19, poliomyelitis, and Crimean-Congo haemorrhagic fever.