Overview
- Charité researchers tested about 24,000 mosquitoes in pooled samples and concluded the virus is now established in Berlin rather than repeatedly imported from elsewhere.
- Measured mosquito infection rates were reported as ranges because insects were tested in groups of ten, with estimated pool-based rates of 0.6–6% in 2023 and 0.2–2% in 2024.
- The Robert Koch Institute counts of confirmed human cases in Berlin and Germany remain low, but Charité experts say a large dark figure is likely and estimate infections in Berlin could be at least 100 times higher than reported.
- Virus detection varied within short distances, with fewer positives in a nature reserve and more in a park-like residential area and a cemetery, suggesting local bird–mosquito ecology drives hotspots.
- Public-health advice focuses on sustained mosquito surveillance, removing breeding sites like open water containers, and personal protection such as repellents and long clothing, with older people urged to be especially cautious and to seek medical care for fever after mosquito bites.