title: [Detection of TTV DNA and analysis of partial TTV gene sequence in different population of Guizhou area].
abstract: OBJECTIVE
  To investigate the prevalence of transfusion-transmitted virus (TTV) infection and analyze partial nucleotide sequence of TTV isolated from Guizhou area.
  
  
  METHODS
  A nested polymerase chain reaction (nPCR) assay with two-set of primers deduced from the first read frame of TTV genome was established, the prevalence of TTV DNA were detected in 395 sera collected from different population in Guizhou area. The partial genes of TTV DNA fragments amplified from two liver disease patients and one hemodialysis patient were analysed and then compared with gene from Japan strain.
  
  
  RESULTS
  The positive rates of TTV DNA in 62 normal adults, 37 blood donors, 50 hemodialysis patients, 107 intravenous drug users (IVDUs), 139 patients with liver diseases were 6.45% (4/62), 8.10%(3/37), 26.00% (13/50), 25.23% (27/107) and 16.54% (23/139), respectively. The homology of TTV DNA sequence was from 99% to 100% within three Guizhou strains. As compared with published sequence, the nucleotide homology is 98% between all three Guizhou strains and Japan strain.
  
  
  CONCLUSIONS
  There are TT virus infection in Guizhou area, the infection rates were higher in hemodialysis patients and IVDUs. The nucleotide homology was high between Guizhou strain and Japan strain.
authors.affiliation: Department of Infectious Diseases, The Affiliated Hospital of Guiyang Medical College, Guiyang 550004, China.
authors.forename: Jingjuan
authors.initials: J
authors.lastname: Ding
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001782:Blood Donors; D002681:China / Q000453:epidemiology; D004266:DNA Virus Infections / Q000453:epidemiology / Q000821:virology*; D004279:DNA, Viral / Q000097:blood*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D022783:Torque teno virus / Q000235:genetics* / Q000302:isolation & purification
chemical_list: D004279:DNA, Viral