The tiger mosquito and the yellow fever mosquito are animals that do not originate in the Netherlands. They can spread various viral diseases in humans and animals, such as dengue (dengue fever), Zika, chikungunya, yellow fever, West Nile virus and various forms of encephalitis. According to the NVWA, the chance that tiger mosquitoes actually transmit these diseases in the Netherlands is small.
The critters probably come along with imported car tires and bamboo plants. Supervisor NVWA states on the website only where and when the exotic mosquitoes are found. It is not stated on the site how many mosquitoes were made per find.
In recent years, the mosquito has appeared countless times in the Netherlands. In addition to the above places, they were also found in Aalten, Almere, Amstelveen, Alblasserdam, Arnhem, Bladel, Breda, Deurne, Eindhoven, Emmeloord, Etten-Leur, Hardenberg, Hoogeveen, Weert, Haarlemmermeer, Honselersdijk, Lansingerland, Montfoort, Noordoostpolder, Rotterdam, Uithoorn, Valkenburg aan de Geul, Veenendaal, Westervoort and Westland. Last year there were a total of 603 copies. That is considerably more than in 2017, when there were still 194.