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 20-26 August 2023 and includes updates on avian influenza, botulism, autochthonous dengue, Legionnaires' disease, COVID-19, West Nile virus, Chikungunya and dengue.