Fig. 4: Geographic variation in mosquito density and suitability for disease transmission.

A, C, E The average adult density during the active season of Ae. albopictus in North America, Europe, and Asia respectively between the years 2010−2019. B, D, F The average number of months the reproduction number was greater than one (Rt > 1) in North America, Europe, and Asia respectively between the years 2010−2019. In D the yellow circles are centred on regions within which autochthonous dengue transmission was detected between the years 2010 − 2019 and the red circles indicate the locations of outbreaks after this period. Source data are provided as a Source Data file.