First report of two Asian invasive mosquito species, Aedes japonicus and Aedes koreicus, in Piedmont, northwest Italy.

Introduction: Aedes japonicus japonicus and Aedes koreicus are two invasive mosquitoes recently reported in various parts of Europe, including areas very close to Piedmont where, since 2012, specific tools have been implemented to allow the early detection of invasive mosquitoes, through the surveillance of the main points of entry.

Results: Thanks to the regional surveillance system, Ae. j. japonicus was intercepted in Piedmont for the first time in 2019, in the northernmost part of the region and now it is reported in six provinces. Ae. koreicus was intercepted for the first time in 2012 in three provinces.

Discussion and conclusion: The spread of these two invasive mosquitoes in Europe is still ongoing. Where Aedes albopictus is abundant, probably their presence goes undetected, therefore, it is crucial to begin surveillance early in the season. Due to their competence for several arboviruses and tolerance to the cold temperatures Ae. j. japonicus and Ae. koreicus represent a further concern for Public Health. A longer seasonal period for surveillance and response to mosquito-borne diseases, as well as a shift up of these activities to previously uncovered altitudes are indeed needed.