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Numbers of travelers from high dengue risk areas to Japan per year (A), and numbers of travelers from Japan to high dengue risk areas (B), from 2011 to 2018. Each bar chart is color-coded by area or country. The number of people visiting Japan from dengue-endemic areas has increased compared with the number of people traveling to dengue-endemic areas from Japan. . (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
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Among the East Asian areas with continuous or frequent dengue risks, visitors from Taiwan and Hong Kong account for the majority (Fig. 4).
Numbers of imported dengue fever cases in Japan each year from 2011 to 2018. The total number of imported cases has fluctuated between 113 and 343.
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The number of imported dengue cases have ranged from approximately 200 to 300 (Fig. 5), and have not been consistent with the increases in the number of travelers.