title: Prevalence of hepatitis G virus infection and homology of different viral strains in Southern China.
abstract: OBJECTIVE
  To investigate the prevalence of hepatitis G virus (HGV) infection and to analyse the homology of different HGV strains in Southern China.
  
  
  METHODS
  A total of 1993 sera from different groups in Guangdong, Hong Kong, and Yunnan were detected by reverse transcription polymerase chain reaction (RT-PCR). The nucleotide sequences of 5'untranslated region (5'UTR) derived from 20 strains and NS5 region from 3 strains were determined.
  
  
  RESULTS
  The positive rate of HGV RNA was 0.89 % in community population, 2.57 % in blood donors, 17.86 % in intravenous drug abusers, 14.13 % in patients with hemodialysis, 13.66 % in those with hepatocellular carcinoma, 25.30 % in non A-E hepatitis, 7.22 % in hepatitis B, 12.73 % in hepatitis C, 41.67 % in patients received bone marrow transplantation, respectively. The homology was 90.40-100 % in 5'UTR among different strains, while that of NS5 region was 93.3-94 % in nucleotide sequence, and 97-99.2 % in amino acid sequence.
  
  
  CONCLUSIONS
  These results showed that there was a high incidence of HGV infection in patients from Southern China, being treated for bone marrow transplantation, hepatocellular carcinoma and those on haemodialysis. Furthermore, there was also a high frequency of co-infection of HGV with HBV, HCV, non A-E viral hepatitis and that among intravenous drug abusers. The study also showed that sequence variation in different strains was associated with geographical factors but there was no significant difference in 5'UTR in circulating viruses between different patient groups. Finally, by sequential analysis of viral species present in individual patients over a three months period there was no evidence of sequence variation in the 5' UTR.
authors.affiliation: Department of Infectious Diseases, the Third Affiliated Hospital, Zhongshan University, Guangzhou 510630, Guangdong Province, China. ligangzh@pub.guangzhou.gd.cn
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.forename: Hui-Hui
authors.initials: HH
authors.lastname: Ma
authors.forename: Geroge K K
authors.initials: GK
authors.lastname: Lau
authors.forename: Yin-Kit
authors.initials: YK
authors.lastname: Leung
authors.forename: Chun-Lan
authors.initials: CL
authors.lastname: Yao
authors.forename: Yu-Tian
authors.initials: YT
authors.lastname: Chong
authors.forename: Wen-Hui
authors.initials: WH
authors.lastname: Tang
authors.forename: Ji-Lu
authors.initials: JL
authors.lastname: Yao
mesh_terms: D020121:5' Untranslated Regions; D001483:Base Sequence; D002681:China / Q000453:epidemiology; D018076:DNA, Complementary / Q000235:genetics; D004279:DNA, Viral / Q000235:genetics; D018178:Flaviviridae Infections / Q000453:epidemiology* / Q000821:virology*; D029407:GB virus C / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification*; D014644:Genetic Variation; D006525:Hepatitis, Viral, Human / Q000453:epidemiology* / Q000821:virology*; D006801:Humans; D008969:Molecular Sequence Data; D012367:RNA, Viral / Q000235:genetics; D012689:Sequence Homology, Nucleic Acid; D017361:Viral Nonstructural Proteins / Q000235:genetics
chemical_list: D020121:5' Untranslated Regions; D018076:DNA, Complementary; D004279:DNA, Viral; C096041:NS5 protein, flavivirus; D012367:RNA, Viral; D017361:Viral Nonstructural Proteins