The ECDC Communicable Disease Threats Report (CDTR) is a weekly bulletin for epidemiologists and health professionals on active public health threats. This issue of CDTR covers the period 25-31 January 2025, and includes updates on influenza A(H5N1), chikungunya, dengue, mpox, Marburg virus disease, suspected viral haemorrhagic fever in the Democratic Republic of Congo, and Ebola.