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Identification of a novel GB type C virus/hepatitis G virus subtype in patients with hematologic malignancies

The existence of four GB C virus/hepatitis G virus (GBV‐C/HGV) subtypes has been reported. The subtype was determined in 16 multitransfused GBV‐C/HGV infected patients prior to bone marrow transplantation by comparing the 5′ untranslated region (5′ UTR) sequence with 39 available sequences. Phylogenetic and bootstrap analyses were carried out with PHYLIP package 3.5c. In the samples with undefined subtype, the whole 5′ UTR was cloned and sequenced. Comparison of distances showed that the isolates from 12/16 and 4/16 patients belonged theoretically to subtypes 2a and 2b, respectively. The phylogenetic tree and bootstrap analyses confirmed this result in only 11/16 samples. Analysis of the entire 5′ UTR from the remaining five samples with undefined GBV‐C/HGV subtype revealed genomic variability within the isolates from each patient and between the isolates of different patients. Evolutionary distances, phylogenetic tree, and bootstrap showed that the isolates from these samples were grouped in a separate branch, different from the published subtypes. In conclusion, a novel GBV‐C/HGV subtype was found in a group of multitransfused patients with GBV‐C/HGV infection. J. Med. Virol. 57:80–84, 1999. © 1999 Wiley‐Liss, Inc.