As France faces an increasing threat from dengue fever and the invasive tiger mosquito, public health officials and researchers are deploying innovative strategies to combat the spread of the virus. The Aedes albopictus mosquito, known for its aggressive daytime biting and distinctive black-and-white stripes, has established populations across southern France and is now capable of transmitting dengue locally, raising concerns about wider outbreaks.
According to health authorities, dengue is a viral illness transmitted through the bite of infected mosquitoes, primarily Aedes aegypti and Aedes albopictus. Symptoms include high fever, severe headache, joint and muscle pain, rash and in some cases, bleeding or plasma leakage that can progress to life-threatening severe dengue. While many infections are mild or asymptomatic, the disease poses a growing risk in regions where the vector mosquito has become established due to climate change and increased travel.
In response, scientists in Montpellier are exploring a dual approach to suppress tiger mosquito populations: releasing sterilized male mosquitoes infected with a specific strain of Wolbachia bacteria. This method, known as the incompatible insect technique, prevents wild females from producing viable offspring when they mate with these modified males. Researchers say early results show promise, with significant reductions in mosquito density in targeted areas.
Similar efforts are underway in Brive-la-Gaillarde, where officials reported releasing over 12 million sterilized tiger mosquitoes this year as part of a large-scale pilot program. Local authorities described the outcomes as “very promising,” noting a measurable decline in biting activity and mosquito presence in treated neighborhoods. The initiative aims to break the transmission cycle of dengue and other mosquito-borne viruses like chikungunya and Zika.
Beyond biological controls, new tools are being developed to protect public spaces. A collaboration between outdoor furniture maker Fermob and technology firm Wiliv has resulted in Mojo, a mosquito-repelling bollard designed for use in gardens and terraces. The device emits a non-toxic, plant-based repellent to create a protective zone, offering residents a way to enjoy outdoor areas without relying on sprays or nets.
Experts emphasize that while these interventions show potential, sustained success depends on community engagement, surveillance, and integrated vector management. Removing standing water where mosquitoes breed, using screens and repellents, and reporting suspected cases remain critical components of prevention. As dengue continues to emerge in parts of Europe previously unaffected, health officials warn that vigilance and adaptive strategies will be essential to prevent local transmission from becoming endemic.
