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2026-07-25 22:20 UTC → 2026-08-05 18:13 UTC ·
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French tiger mosquito expansion spread fuels dengue threat dengue, chikungunya risk
Since the mid‑2026 rollout of weekly Weekly releases of 1.5 million sterile male *Aedes albopictus* began in mid‑2026, and the expansion programme is being scaled up to tens of city‑wide anti‑mosquito programmes millions of insects per year by companies such as Terratis. Pilot releases in Bordeaux Montpellier and Périgueux, the tiger mosquito now occupies 83 Brive‑la‑Gaillarde have already halved local egg fertility, while Bordeaux Metropole has adopted a city‑wide roadmap that maps larval habitats, creates a “Pole of France’s 96 departments. The regional health agency ARS Nouvelle‑Aquitaine Excellence” for control and private operator Altopictus continue intensified surveillance of dengue, Zika trains municipal agents and chikungunya, urging citizens residents to eliminate standing water. In July 2026 officials highlighted 30 autochthonous dengue infections recorded hidden water sources. Municipal actions now include anti‑mosquito stations, provision of free BTi‑based larvicide kits in 2025 Bordeaux, and the first locally acquired cases in Carmaux. Residents promotion of the Bois Roulot district in Montceau‑les‑Mines reported a rapid increase in mosquito swarms, severe bites, plant‑based repellents and lodged a petition after receiving no reply from the town hall. The French agency ANSES advised emptying or filling stagnant containers with sand colour‑choice advice to remove breeding sites, noting reduce bites. A severe summer heatwave temporarily suppressed mosquito activity, but experts warn that the resilient tiger mosquito can lay eggs in as little as a few millimetres of water. Municipal pest‑control officers rebound when cooler, wetter conditions return. The Interreg Tiger 2.0 citizen‑science network, active in Millau carried out home inspections, distributed about 20 000 flyers, France, Germany and promoted screened containers Switzerland, mobilises “mosquito ambassadors” to deploy ovitraps and gutter cleaning. submit specimens for egg‑viability analysis, enhancing surveillance across the Upper‑Rhine region. Health authorities confirmed have launched an enhanced arbovirus surveillance programme for May–November 2026 after a second record 809 autochthonous chikungunya cases in 2025. By August, five new local transmission episodes were confirmed – chikungunya in Tarn and Gironde, dengue case on the mainland, in Sète (Hérault), reinforcing the risk posed by the vector. Local public‑health actions now focus on vector control around patients’ homes while Tarn and Hérault, and West Nile virus in Bouches‑du‑Rhône – underscoring the broader strategy growing disease risk. Public‑health guidance stresses eliminating standing water in private gardens (which host ~80 % of sterile‑male releases, larvicide distribution, subsidised breeding sites), using screened containers, and reporting suspected cases. Subsidies for mosquito traps in Périgueux and ongoing community outreach continues. Overall, the combined measures aim to curb breeding and limit further arbovirus transmission, the vector, but growing public frustration over complaints of delayed municipal responses underscores ongoing implementation challenges. persist in towns such as Montceau‑les‑Mines.