This issue of the ECDC Communicable Disease Threats Report (CDTR) covers the period 29 September-5 October 2019 and includes updates on COVID-19 associated with SARS-CoV-2, Crimean-Congo Haemorrhagic fever – Europe – 2020, West Nile virus - Monitoring season 2020, Monitoring of the environmental suitability of Vibrio growth in the Baltic Sea - Summer 2020, Ebola virus disease - eleventh outbreak - Democratic Republic of the Congo - 2020 and dengue in the French Antilles - 2020.