Figure 1: Geographic relationships between Xishuangbanna and other Asian dengue outbreak countries and areas in 2015.

The screenshot of base satellite map of Asia was obtained from Google Earth (http://google.com/). The boundary of Yunnan province was marked in blue dotted line. The red oval was used to mark Xishuangbanna state of Yunnan province and the yellow block represents the other dengue epidemic areas in China and around Asia. It’s obvious that Yunnan province is geographically a central and connecting area among them, which led to a serious trend of dengue epidemic in Yunnan in recent years. (Scientific Reports remains neutral with regard to jurisdictional claims in published maps).