This issue of the ECDC Communicable Disease Threats Report (CDTR) covers the period 27 June-3 July 2021 and includes updates on the UEFA European Football Championship 2020 (2021), Vibrio growth in the Baltic Sea, COVID-19, Monkeypox, West Nile virus, Middle East respiratory syndrome coronavirus (MERS-CoV), Chikungunya, Dengue and Poliomyelitis.