title: [Drug resistance, genotype, and serotype of hepatitis B virus in nucleos(t)ide analogue naive patients with chronic hepatitis B].
abstract: OBJECTIVE
  To investigate drug resistance, genotype and serotype of hepatitis B virus (HBV) in nucleos(t)ide analogue (NA) naive patients with chronic hepatitis B (CHB).
  
  
  METHODS
  Full-length reverse transcriptase region of HBV DNA was amplified by semi-nested polymerase chain reaction from 97 NA-naive CHB patients, and the PCR product was sequenced, and analyzed to screen 11 classical antiviral drug resistance mutation sites and to identify HBV genotypes, subgenotypes and serotypes.
  
  
  RESULTS
  Wild-type sequences were found at all of the 11 classical antiviral drug resistance mutation sites from all samples. The patients were infected with either genotype B (36.1%, 35/97) or C (63.9%, 62/97) HBV. The former were all belonged to subgenotype B2 strain; while the latter were divided further into subgenotype C2 (91.9%, 57/62), subgenotype C1 (6.5%, 4/62) and unknown subgenotype (1.6%, 1/62). The 71.9% (23/32) of HBV genotype B patients were born in southern China, while 81.6% (40/49) of HBV genotype C patients were from northern China, showing a clear geographic distribution (Chi-square test = 23.19, Probability value less than 0.01). Of 97 CHB patients, 59 (60.8%) were serotype adr associated with genotype C, while 37 (38.1%) were adw related to genotype B (subgenotype B2) (Chi-square test = 87.83, P less than 0.01).
  
  
  CONCLUSIONS
  The wild-type HBV strains prevail in NA-naive CHB patients, whose HBV genotypes, subgenotypes and serotypes are associated with their places of birth.
authors.affiliation: Department of Infectious Diseases, Peking University Third Hospital, Beijing 100191, China.
authors.forename: Xiao-guang
authors.initials: XG
authors.lastname: Li
authors.forename: Jie
authors.initials: J
authors.lastname: Xu
authors.forename: Bao-ming
authors.initials: BM
authors.lastname: Liu
authors.forename: Jing-xian
authors.initials: JX
authors.lastname: Yang
authors.forename: Ling
authors.initials: L
authors.lastname: Yan
authors.forename: Tong
authors.initials: T
authors.lastname: Li
authors.forename: Hui
authors.initials: H
authors.lastname: Zhuang
mesh_terms: D000328:Adult; D000998:Antiviral Agents / Q000627:therapeutic use; D001483:Base Sequence; D004279:DNA, Viral / Q000097:blood / Q000235:genetics*; D024882:Drug Resistance, Viral / Q000235:genetics*; D005260:Female; D014644:Genetic Variation; D005838:Genotype; D006515:Hepatitis B virus / Q000145:classification / Q000235:genetics; D019694:Hepatitis B, Chronic / Q000188:drug therapy / Q000453:epidemiology / Q000821:virology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009711:Nucleotides / Q000627:therapeutic use; D016133:Polymerase Chain Reaction / Q000379:methods; D017422:Sequence Analysis, DNA; D012703:Serotyping; D055815:Young Adult
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D009711:Nucleotides