Abstract
We completely sequenced nine HCV-6 variants from Vietnam. They are grouped into six lineages beyond the 24 assigned subtypes, 6a-6xa, and 14 unclassified lineages that have been recently described with full-length genomes. Co-analysis with reference sequences in the NS5B region identified additional 22 such lineages, which made the total taxonomic number of HCV-6 increased to 66 that might be recognized at the subtype level. Because two of these six lineages revealed in this study each had >3 epidemiologically unlinked isolates identified, we proposed to assign them new subtypes 6xb and 6xc in following the eXtended format recently recommended in the expanded HCV nomenclature.
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