title: Metronidazole-resistant Helicobacter pylori in an urban Asian population.
abstract: BACKGROUND
  Helicobacter pylori eradication is the mainstay in the treatment of H. pylori-associated peptic ulcer disease. Metronidazole is an important component in most eradication regimens. However, the presence of metronidazole-resistant H. pylori adversely affects the efficacy of such regimens. We aimed to study the prevalence of metronidazole resistance in our population, and the factors associated with its presence.
  
  
  RESULTS
  From September 1993 to September 1996, 459 H. pylori isolates were collected and analysed. The overall resistance rate was 62.7%. The rate was significantly higher among women compared with men (P < 0.05). When the results were analysed according to each year, there was a significant increase in the resistance rate from 50.5% in the first year to 72.7% in the third year (P = 0.0039).
  
  
  CONCLUSIONS
  There was a significant rise in the prevalence of metronidazole resistance over a 3-year period. The presence of metronidazole resistance adversely affects the eradication rates of nitroimidazole-based regimens. Hence, in a population with a high prevalence of metronidazole resistance, the use of non-nitroimidazole-based therapy may be more efficacious. This information on resistance rates is important for the empirical choice of antibiotic against H. pylori in a population.
authors.affiliation: Department of Medicine, Changi General Hospital, Singapore. ekteo-99@yahoo.com
authors.forename: E K
authors.initials: EK
authors.lastname: Teo
authors.forename: K M
authors.initials: KM
authors.lastname: Fock
authors.forename: T M
authors.initials: TM
authors.lastname: Ng
authors.forename: C J
authors.initials: CJ
authors.lastname: Khor
authors.forename: A L
authors.initials: AL
authors.lastname: Tan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D001208:Asia; D004352:Drug Resistance, Microbial; D005260:Female; D016481:Helicobacter Infections / Q000150:complications / Q000188:drug therapy* / Q000382:microbiology; D016480:Helicobacter pylori / Q000187:drug effects / Q000302:isolation & purification; D006801:Humans; D008297:Male; D008795:Metronidazole / Q000627:therapeutic use*; D008875:Middle Aged; D010437:Peptic Ulcer / Q000382:microbiology; D015995:Prevalence
chemical_list: D000900:Anti-Bacterial Agents; D008795:Metronidazole