title: Secondary resistance among 554 isolates of Helicobacter pylori after failure of therapy.
abstract: In a study to determine secondary resistance among Helicobacter pylori isolates, gastroenterologists from several German cities submitted over a 3-year period to centre A (Regensburg) or centre B (Freiburg) gastric biopsies from patients in whom one or more therapies to eradicate Helicobacter pylori had failed. Rates of resistance among the collections of 302 (centre A) and 252 (centre B) isolates were, respectively, as follows: to metronidazole, 75% and 66%; to clarithromycin, 58% and 49%; to amoxicillin, 0%; to ciprofloxacin, 9%; to doxycycline, 0%; and to rifampin, 0%. Resistance to clarithromycin was associated with metronidazole resistance in 89% and 85% of the isolates in centre A and centre B, respectively.
authors.affiliation: Institute for Medical Microbiology and Hygiene, University of Freiburg, Germany. Markus-Heep@web.de
authors.forename: M
authors.initials: M
authors.lastname: Heep
authors.forename: M
authors.initials: M
authors.lastname: Kist
authors.forename: S
authors.initials: S
authors.lastname: Strobel
authors.forename: D
authors.initials: D
authors.lastname: Beck
authors.forename: N
authors.initials: N
authors.lastname: Lehn
mesh_terms: D000658:Amoxicillin / Q000494:pharmacology; D002939:Ciprofloxacin / Q000494:pharmacology; D017291:Clarithromycin / Q000494:pharmacology; D004352:Drug Resistance, Microbial; D016480:Helicobacter pylori / Q000187:drug effects*; D006801:Humans; D008795:Metronidazole / Q000494:pharmacology; D008826:Microbial Sensitivity Tests
chemical_list: D008795:Metronidazole; D002939:Ciprofloxacin; D000658:Amoxicillin; D017291:Clarithromycin