| new prevalence estimate of tt virus (ttv) infection in low- and high-risk population from são paulo, brazil. | the prevalence of tt virus (ttv) infection was investigated by polymerase chain reaction (pcr) in low- (blood donors and healthy children/adolescents) and high-risk (hemophiliacs) groups from são paulo, brazil. primers based on the untranslated region (utr) of the viral genome proved to be much more ubiquitous, leading to much higher frequencies for both groups (>or= 81%) than the earlier n22-pcr directed to the open reading frame 1 (blood donors, 5.5%, and hemophiliacs, 42.3%). the utr-pcr also ... | 2002 | 12219117 |
| tt virus (ttv) genotyping in blood donors and multiple transfused patients in brazil. | tt virus (ttv) is widely distributed in the general population. the objective of the present study was to investigate the prevalence and distribution of ttv genotypes among blood donor candidates and multiple transfused patients in the southeast region of the state of são paulo, brazil. ttv-dna detection by amplification of a segment of the orf-1 region, presented a prevalence of 11.9% in 270 serum samples from blood donors, of 46.2% in 18 samples from patients with coagulopathies, and of 31.8% ... | 2007 | 17570047 |