title: Single and double mutations in gyrA but not in gyrB are associated with low- and high-level fluoroquinolone resistance in Helicobacter pylori.
abstract: In one French hospital the rate of resistance to ciprofloxacin in Helicobacter pylori was 3.3% (2 of 60 strains) in 1999. The six resistant clinical strains (four from 1996 and two from 1999) and three ciprofloxacin-selected single-step mutants studied carried one gyrA mutation but none in gyrB. Clinafloxacin and garenoxacin were the most active fluoroquinolones against these mutants. Occurrence of a second gyrA mutation was associated with high MICs of all fluoroquinolones tested.
authors.affiliation: Laboratoire de Bactériologie, Centre Hospitalo-Universitaire Saint-Antoine, Assistance Publique-Hôpitaux de Paris, Université Paris VI, Paris, France. jacques.tankovic@sat.ap-hop-paris.fr
authors.forename: Jacques
authors.initials: J
authors.lastname: Tankovic
authors.forename: Christine
authors.initials: C
authors.lastname: Lascols
authors.forename: Quentin
authors.initials: Q
authors.lastname: Sculo
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Petit
authors.forename: Claude-James
authors.initials: CJ
authors.lastname: Soussy
mesh_terms: D000890:Anti-Infective Agents / Q000494:pharmacology*; D027081:DNA Gyrase / Q000235:genetics*; D024881:Drug Resistance, Bacterial; D024841:Fluoroquinolones / Q000494:pharmacology*; D005602:France / Q000453:epidemiology; D005838:Genotype; D016481:Helicobacter Infections / Q000453:epidemiology / Q000382:microbiology; D016480:Helicobacter pylori / Q000187:drug effects*; D006801:Humans; D009154:Mutation / Q000235:genetics / Q000502:physiology*; D010641:Phenotype; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D027081:DNA Gyrase