In July 2024, the Agence régionale de santé d’Occitanie reported the first autochthonous dengue infection of the year near Montpellier, marking the earliest in a season that experts fear could witness unprecedented outbreaks [1].
As Paris gears up to host the Olympics in 2024, this troubling precedent raises alarms about the potential for the city to become a hotspot for dengue fever, a disease transmitted by the Aedes albopictus or tiger mosquito.
The confluence of a global sporting event and favorable breeding conditions for mosquitoes could create a perfect storm for dengue proliferation.
The growing threat of dengue in France
While more common in tropical regions, dengue fever has seen a northward expansion in Europe, facilitated by climate change and the increasing presence of the tiger mosquito in southern France.
Historically limited to warmer climates, these mosquitoes have established populations in over 71 French départements or counties, including Paris [2].
This geographical spread is significant because it brings the vector—and the viruses it carries—into closer contact with larger populations, increasing the risk of outbreaks.
The University of Montpellier‘s report highlights that the tiger mosquito’s active season in France now extends from May to November, peaking during summer [1].
This aligns dangerously with the timing of the Paris Olympics, set for July to August 2024, potentially elevating the risk of dengue transmission to both participants and spectators.
Olympic preparations and public health measures
The French health authorities have increased surveillance and control activities in response to the dengue threat. They are running public education campaigns to raise awareness about preventing mosquito bites, eliminating standing water to prevent mosquito breeding, and conducting targeted insecticide spraying [1].
These efforts are part of a larger plan to manage mosquito populations and reduce disease transmission during the Olympics.
Experts emphasize the importance of proactive measures. Dr. Yannick Simonin, a virologist at the University of Montpellier, stresses that while the threat of dengue is real, current strategies and public cooperation can help reduce risks.
Community involvement in mosquito control practices, such as removing standing water and using mosquito repellent, is crucial in preventing outbreaks [1].
The effectiveness of preventive measures will rely on the weather conditions before and during the games. Warmer temperatures and rainfall could promote mosquito breeding, challenging control efforts.
Dr. Simonin also mentions that climate change affects unpredictable weather patterns, adding complexity to prevention strategies [1].
With the combined efforts of global and local health authorities, the hope is to keep dengue fever at bay, allowing everyone to focus on the spirit and competition of the Games.
[1] University de Montpelier. Olympic Games 2024: Tiger mosquito and dengue fever surveillance stepped up
[2] Institut Pasteur. Tiger mosquito in France: 71 Departments on red alert
