Communicable disease threats report, 7-13 June 2025, week 24

This week’s topics Week 24, 7–13 June 2025 1. Seasonal surveillance of West Nile virus infections started in week 23 2. Weekly seasonal surveillance of West Nile virus infection – 2025 3. Measles – Multi-country (World) – Monitoring European outbreaks – monthly monitoring 4. Overview of respiratory virus epidemiology in the EU/EEA 5. Autochthonous chikungunya virus disease – Réunion and Mayotte, France, 2024–2025 6. Mass gathering monitoring – Jubilee of 2025 in Italy 7. Mass gathering monitoring – Hajj – Kingdom of Saudi Arabia – 2025 8. Mass gathering monitoring – EuroPride - Portugal – 2025 9. Outbreak of measles associated with international mass gathering - Germany - 2025 10. Invasive pneumococcal disease among shipyard workers in Turku, Finland 11. Influenza A(H5N1) – Multi-country (World) – Monitoring human cases 12. Risk Assessment under production Executive Summary Seasonal surveillance of West Nile virus infections started in week 23 • The seasonal surveillance of West Nile virus (WNV) infections in the EU/EEA and EU- neighbouring countries started in week 23, 2025. • Updates on risk areas for locally acquired WNV infection will be reported weekly during the transmission season. • Enhanced analysis of the WNV epidemiological situation will be provided monthly. Weekly seasonal surveillance of West Nile virus infection – 2025 • This is the first report of the weekly seasonal surveillance of West Nile virus (WNV) infections in 2025. • Since the beginning of...