Fig. 2

Spatial distribution of national parks and destinations of travelers by country in central Tokyo. In each panel, the horizontal axis shows longitude and the vertical axis shows latitude. The blue stars indicate the locations of national parks with potential risk of dengue transmission and the red circles represent the destinations of international travelers. While the nine countries on the left were dengue free (sporadic cases only), the remaining nine countries on the right were dengue endemic countries (regional transmission and continuous transmission)