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. 2021 Jan 12;11:513. doi: 10.1038/s41598-020-79951-2

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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HIV-1 transmission clusters. The network was constructed using a custom R script with the network package in R version 4.0.2 software. (A) Infection route and region-associated transmission clusters. Different colours represent different provinces. Different shapes represent different infection routes: solid square: heterosexual men; solid circle: heterosexual women; solid triangle: IDU; solid diamond: MSM. (B) Size of HIV-1 transmission clusters among the MSM. (C) Distribution of HIV-1 transmission degree. Node represents individuals in the network; degree represents the number of edges that link one node to other nodes; size represents the number of individuals in a cluster.