Belgium is witnessing a rise in sightings of the invasive tiger mosquito, with citizens in eight municipalities reporting its presence since May, according to the Institute of Tropical Medicine (ITM) on Wednesday.
The latest additions to the list include Zaventem and Kortenberg, both situated near Brussels. Earlier reports came from Merelbeke-Melle, Aat, Kessel-Lo, Hoegaarden, Wijnegem, and Etterbeek. This brings the total number of Belgian municipalities where tiger mosquitoes have been observed this season to eight.
Authorities emphasize that the situation is being closely monitored. The ITM has been conducting targeted research into the spread of the species, noting that tiger mosquitoes managed to survive the past winter in Sint-Joost-ten-Node.
This survival raises concerns that the number of municipalities reporting sightings could grow further after the coming winter months.
Wim Van Bortel, entomologist at ITM, explained how the mosquitoes often enter Belgium: “Many tiger mosquitoes arrive via cars driven by holidaymakers returning from southern destinations such as France, where the species is well established.” Once introduced, the mosquito is capable of adapting and surviving in Belgium’s changing climate.
The tiger mosquito, scientifically known as Aedes albopictus, is recognized globally as an invasive species. Beyond being a nuisance due to its aggressive daytime biting, it is also a known carrier of several viruses, including dengue, chikungunya, and Zika.
While none of these diseases have been detected in Belgium so far, experts caution that the presence of the mosquito raises the risk of potential transmission in the future.
The mosquito’s season typically lasts until the end of October, when colder weather slows its activity. However, with evidence of overwintering populations, health officials are preparing for a more permanent presence in Belgium. Such persistence could lead to greater risks in the warmer months ahead.
Local municipalities where the mosquito has been detected are stepping up awareness campaigns. Residents are being encouraged to report sightings and take preventive measures, such as eliminating standing water where mosquitoes can breed.
Flowerpot trays, clogged gutters, and rainwater barrels are among the most common breeding grounds. Authorities also highlight the importance of international cooperation.
As the mosquito spreads across Europe, joint monitoring and control programs are seen as essential to preventing outbreaks of mosquito-borne diseases. Belgium is already working alongside neighboring countries on cross-border research and prevention strategies.
Despite the rising number of sightings, health experts reassure the public that the risk of immediate infection remains low. The absence of locally transmitted cases of dengue, chikungunya, or Zika means that for now, the situation is under control.
However, vigilance is essential, as imported cases from travelers could provide the trigger for local outbreaks if the mosquito population continues to grow.
As Belgium approaches the end of the current mosquito season, the ITM and local health authorities remain focused on surveillance, prevention, and public education. The challenge of managing this invasive species is expected to intensify in the coming years.
