| prevalence and genotypic distribution of tt virus in athens, greece. | the prevalence of tt virus (ttv) infection in various population groups from athens, greece, was assessed by the polymerase chain reaction (pcr) using two primer sets from distinct regions of the genome: the conventional set derived from the open reading frame-1 (orf-1) and the new, highly sensitive set targeting the region that includes the tata signal localized upstream of orf-2. based on both primer sets, ttv dna was detected in 42/50 (84.0%) healthy individuals, 42/50 (84.0%) chronic hepatit ... | 2001 | 11536255 |