title: Clarithromycin resistance among Helicobacter pylori strains isolated from children: prevalence and study of mechanism of resistance by PCR-restriction fragment length polymorphism analysis.
abstract: Clarithromycin and metronidazole resistance was 29.1 and 23.9%, respectively, in 96 Helicobacter pylori strains obtained from pediatric patients. No resistance to amoxicillin was observed. Resistance according to patients' ages to clarithromycin and metronidazole was 45.4 and 18.2% in 22 patients from 4 to 8 years old, 30.2 and 20.7% in 53 patients from 9 to 13 years old, and 9.5 and 38.1% in 21 patients from 14 to 18 years old, respectively. The A2143G mutation was the most prevalent (82.1%) among clarithromycin-resistant strains.
authors.affiliation: Department of Microbiology, Hospital Universitario de la Princesa, Madrid, Spain. talaraco@helicobacterspain.com
authors.forename: Teresa
authors.initials: T
authors.lastname: Alarcón
authors.forename: Alba E
authors.initials: AE
authors.lastname: Vega
authors.forename: Diego
authors.initials: D
authors.lastname: Domingo
authors.forename: Maria Josefa
authors.initials: MJ
authors.lastname: Martínez
authors.forename: Manuel
authors.initials: M
authors.lastname: López-Brea
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D017291:Clarithromycin / Q000494:pharmacology*; D004351:Drug Resistance; D024881:Drug Resistance, Bacterial / Q000235:genetics*; D016481:Helicobacter Infections / Q000453:epidemiology*; D016480:Helicobacter pylori / Q000187:drug effects* / Q000235:genetics; D008826:Microbial Sensitivity Tests; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D015995:Prevalence
chemical_list: D000900:Anti-Bacterial Agents; D017291:Clarithromycin