ArticleVirologica Sinica2026
Genetic heterogeneity and pathogenic potential of historical Crimean-Congo hemorrhagic fever virus isolates in China.
Article in Virologica Sinica, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The Crimean-Congo hemorrhagic fever virus (CCHFV) poses a significant public health threat. In China, CCHFV has been circulating for decades, yet the genomic diversity and pathogenic potential of the circulating strains remain poorly characterized, hindering risk assessment and countermeasure development. In this study, we recovered 24 historical CCHFV strains isolated between 1966 and 2004 from humans, ticks and jerboas in Xinjiang Uyghur Autonomous Region of China. Whole-genome sequencing was performed, followed by comprehensive analyses of their phylogenetic relationships, in vitro infectivity and in vivo pathogenicity. Phylogenetic analyses revealed high genetic heterogeneity, identifying seven genotypes for the L segment, nine for the M segment (including a novel Asia 4 genotype), and nine for the S segment. Amino acid mutation analysis revealed that the mucin-like domain (MLD) of the glycoprotein (GP) exhibited the highest mutation rate, contributing substantially to sequence diversity. In vitro, Asia 2 (75024) and Asia 3 (79121M18) strains exhibited robust replication in monkey-, hamster-, and human-derived cell lines. In C57BL/6 mice, all four representative strains induced viral replication and specific antibody responses (IgM and IgG), causing mild to moderate pathological damage in the liver, spleen, and kidneys. In IFNAR
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