Communicable disease threats report, 17-23 January 2026, week 4

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 17-23 January 2026 and includes updates on respiratory virus epidemiology in the EU/EEA, avian influenza and Marburg virus disease.