“…Initially, three genotypes of GBV-C were described that correlated with geographic origin [Muerhoff et al, , 1997Okamoto et al, 1997;Takahashi et al, 1997;Saito et al, 1998]; these included isolates from Africa (genotype 1), North America and Europe (genotype 2), and Japan (genotype 3). The number of genotypes expanded to include novel isolates from Myanmar and Vietnam [Naito et al, 1999] representing a fourth genotype, and isolates from South Africa were subsequently shown to represent the fifth genotype [Sathar et al, 1999;Tucker et al, 1999;Tucker and Smuts, 2000;Sathar and York, 2001]. In most studies, the identification of novel genotypes utilized phylogenetic analysis of the 5 0 -untranslated region (5 0 -UTR).…”