Overview

• ECDC reports 27 chikungunya outbreaks in Europe so far in 2025, as Aedes albopictus becomes established in 16 countries and 369 regions, including a first locally acquired case in France’s Alsace.
• France’s season began unusually early with symptoms first recorded on May 27; by July 10 authorities had contained 10 local clusters involving 27 cases after an influx of viraemic travelers from Réunion.
• England logged 73 travel-associated cases in January–June, mainly linked to Sri Lanka, India and Mauritius, while UKHSA says onward transmission is unlikely because the key vectors are not established in the UK.
• Roughly 240,000 cases and about 90 deaths have been reported worldwide this year, and WHO warns the pattern echoes a major outbreak two decades ago that left many with prolonged, disabling joint pain.
• China’s Guangdong province has reported around 8,000 cases, prompting intensive vector-control actions such as house-to-house checks and breeding-site elimination.