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 22-28 February and includes updates on Legionnaires’ disease, chikungunya, dengue, influenza A(H5N1), Ebola, unknown disease in DRC, poliomyelitis, and an overview of respiratory virus epidemiology in the EU/EEA.