Epidemic arboviral diseases are relentlessly increasing in incidence, fueled by urbanisation, scarcity of effective disease and vector control strategies, and globalisation resulting in disease exportation.    This decade, the number of travellers exporting yellow fever virus to non-endemic countries is at a record high.   Furthermore, in 2016, for the first time in documented history, confirmed yellow fever virus was exported in travellers from Africa to Asia, where about 2 billion immunologically naive people live in areas inhabited by the Aedes aegypti mosquito vector and are at risk for transmission.   The case-fatality rate of yellow fever is among the highest of all arboviral diseases, underscoring the threat of a newly emerging epidemic disease problem in Asia.

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