Communicable disease threats report, 31 May - 5 June 2025, week 23

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 31 May - 5 June 2025 and includes updates on Influenza A(H5N1), Middle Eastern Respiratory Syndrome (MERS), Chikungunya virus disease, Dengue, Salmonellosis, Crimean-Congo haemorrhagic fever, and mass gathering monitoring for the Hajj.