Epidemiology of imported travelers with dengue fever in Taiwan from 2011 to 2020

We collected data on imported dengue cases between 2011 and 2020 from Taiwan's Centers for Disease Control to determine changes in the case number and importation rate of dengue. We used open data provided by Taiwan's Centers for Disease Control to extract the number of confirmed imported cases of dengue between 2011 and 2020. From 2011 to 2020, 2883 imported cases of dengue were reported in Taiwan. The importation rate was 25.8 to 46.4 per 100,000 inbound travelers from 2011 to 2020, peaking in 2020. Disease incidence varied between sexes, age groups, seasons (P < .001), and residence from 2011 to 2020. Numerous dengue cases were imported from Indonesia (548 cases), Vietnam (516 cases), and the Philippines (500). For travelers from Taiwan, the risk ratio of becoming infected by dengue was 31,712 for traveling to the Maldives, 3153 to Cambodia, and 996 to Myanmar. In this study, more serotype 1 and 2 strains were reported by Vietnam, and more serotype 3 and 4 strains were reported by Indonesia. Our data indicate that the rate of imported cases of dengue significantly increased annually from 2011 to 2020 in Taiwan, especially during the COVID-19 pandemic (46.4 per 100,000 inbound travelers).