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Genomic heterogeneity and quasispecies composition of GB virus C (GBV-C) within plasma and lymphocyte subsets in a naturally infected blood donor were investigated. For this purpose, fragments from the 5' untranslated region (5' UTR) and the E2 gene recovered from plasma, B and T lymphocytes, were cloned and sequenced. A total of 63 clones was analysed: 95.2 % of them (n=60) - obtained from plasma and cells - were assigned to genotype 2b, while only three derived from plasma corresponded to genotyope 3. The G215A transition within this region was present in 90.9 % of the clones from B lymphocytes, but absent in the remaining cell compartments (P&lt;0.01). Apparently, most of the circulating GBV-C quasispecies in this blood donor were related to the viral population infecting CD8(+) T cells, and B cells to a lesser extent. This is the first report showing the quasispecies nature of GBV-C in lymphocyte subsets within peripheral blood mononuclear cells.

GB virus C quasispecies detected in plasma and lymphocyte subsets in a natural human infection