Spatiotemporal Origin and Cross-Regional Transmission Dynamics of HIV-1 Circulating Recombinant Form (CRF85_BC) in Developed Eastern China: A Seven-Year Comprehensive Molecular Surveillance Study - Takeaways - MDSpire
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Geographic and Temporal Origins and Spread of HIV-1 CRF85_BC Across Developed Eastern China: Findings from Seven Years of Molecular Surveillance

  • By

  • Qin Fan

  • Jiafeng Zhang

  • Jun Jiang

  • Hehe Zhao

  • Xiaohong Pan

  • Hui Xing

  • Yaping Yao

  • Yi Feng

  • Yong Yan

  • Xiaobei Ding

  • Wei Cheng

  • Xin Zhou

  • Yan Xia

  • Chengliang Chai

  • Jianmin Jiang

  • October 24, 2026

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  • 1

    This study analyzed 259 people with CRF85_BC infection identified through Zhejiang Province’s HIV molecular surveillance from 2017 through 2023.

  • 2

    CRF85_BC was detected in Zhejiang in 2017 and had reached all 11 prefecture-level cities by 2023, becoming the province’s fifth most prevalent HIV-1 subtype.

  • 3

    Phylogeographic analysis indicated multiple introductions from Sichuan and Yunnan, followed by sustained transmission within Zhejiang centered on Jiaxing.

  • 4

    Molecular network analysis identified 183 people (70.66%) in 41 clusters. Jiaxing accounted for 48.63% of clustered cases; 58.60% of genetic linkages connected two Jiaxing cases.

  • 5

    Adults aged 60 years or older had higher clustering before adjustment, but age was not independently associated afterward. Nonlocal household registration remained associated with lower clustering odds.

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