title: [Antibiotic resistance of Helicobacter pylori].
abstract: OBJECTIVE
  To examine the infection and bacteria resistance of Helicobacter pylori (H.pylori) to clarithromycin and furazolidone,to determine whether the antibiotic resistance is primary or secondary, and to decide if a new H.pylori infection plays a role in eradication failures.
  
  
  METHODS
  Twenty one H.pylori had been isolated from human biopsy specimens, and antimicrobial susceptibility testing was performed. DNA fingerprints were generated using random amplification polymorphic DNA (RAPD) to determine the identity of H.pylori before and after the eradication therapy.
  
  
  RESULTS
  Eight bacteria resisted against clarithromycin, and one against furazolidone, with the resistant rates 38.1% and 4.8% respectively. The number of primary antibiotic resistance, secondary resistance and new infection was 1 for each.
  
  
  CONCLUSIONS
  Resistance to clarithromycin is more common compared with that to furazolidone. Development of primary and secondary resistance to clarithromycin occurs as a rule in eradication failures. New H.pylori infection plays a role in eradication failures.
authors.affiliation: Department of Gastroenterology, Third Xiangya Hospital, Central South University, Changsha 410013, China.
authors.forename: Fen
authors.initials: F
authors.lastname: Wang
authors.forename: Shou-rong
authors.initials: SR
authors.lastname: Shen
authors.forename: Jian-dang
authors.initials: JD
authors.lastname: Zhou
authors.forename: Can-xia
authors.initials: CX
authors.lastname: Xu
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology / Q000627:therapeutic use; D017291:Clarithromycin / Q000494:pharmacology* / Q000627:therapeutic use; D016172:DNA Fingerprinting; D004269:DNA, Bacterial / Q000032:analysis / Q000235:genetics / Q000302:isolation & purification; D024881:Drug Resistance, Bacterial; D005664:Furazolidone / Q000494:pharmacology* / Q000627:therapeutic use; D016481:Helicobacter Infections / Q000188:drug therapy / Q000382:microbiology; D016480:Helicobacter pylori / Q000187:drug effects* / Q000235:genetics; D006801:Humans; D008826:Microbial Sensitivity Tests; D019105:Random Amplified Polymorphic DNA Technique
chemical_list: D000900:Anti-Bacterial Agents; D004269:DNA, Bacterial; D005664:Furazolidone; D017291:Clarithromycin