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Towards a policy decision on Aedes japonicus : Risk assessment of Aedes japonicus in the NetherlandsStroo A; Ibanez-Justicia A; Braks M; D&V; Z&O (Rijksinstituut voor Volksgezondheid en Milieu RIVM, 2018-07-10)The Dutch government wants to limit the risk for local transmission of mosquito-borne diseases and therefore aims to limit the establishment of invasive exotic mosquitoes in the Netherlands. At the request of the Ministry of Public Health, RIVM and CMV have investigated which approach is appropriate for the Asian bush mosquito, Aedes japonicus. An effective approach requires a tailor-made method and requires choices. Which choices are made depends on the chance of transmission of diseases by a specific mosquito species, the effect of the control and the costs thereof. In the Netherlands, mosquitoes do not form a major problem as vectors of human diseases at the moment. To become problematic, two preconditions are required. There must be human biting mosquitoes that are able to transmit pathogens, and there must be pathogens that can be transmitted by mosquitoes. In the Netherlands such pathogens are rare. In addition, in the Netherlands mosquitoes are not well able to transmit pathogens. The establishment of specific exotic mosquitoes could increase the risk of transmission of pathogens in the Netherlands. The Asian bush mosquito was discovered in the Netherlands in 2012 and was found present in large parts of Lelystad. In recent years, the area, where this species is present, has expanded. This makes it increasingly difficult to fight the mosquito and the costs for the control increase. On the other hand, the risk of transmission of pathogens by Asian bush mosquito is small. This mosquito does not play an important role in outbreaks of mosquito-borne diseases. Only under specific conditions in the laboratory and field can Asian bush mosquito transmit pathogens. Worldwide only a few patients are known who may have become ill through this mosquito. The risk of the Asian bush mosquito in the Netherlands is comparable to that of a number of native mosquito species. The Asian bush mosquito provides a small added risk of spreading diseases in the Netherlands.