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. 2021 Mar 24;12:657966. doi: 10.3389/fmicb.2021.657966

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Copyright © 2021 Liu, Wu, Liu, Nelly, Fu, Kang, Chen, Huang, Wu, Wang, Zhu, Ma, Liu, Zhang, Bao, Lin, Chen and Xia.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The distribution of DENV in Hainan in 2019. The intensity of the colors in the figure indicates the number of dengue cases; the darker the color is, the more dengue cases there were in the area, arrows indicate the possible direction of propagation, dotted lines show the four Districts of Haikou city.