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JAC Advance Access originally published online on November 28, 2002
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Journal of Antimicrobial Chemotherapy (2003) 51, 141-145
© 2003 The British Society for Antimicrobial Chemotherapy

Characteristics of clinical Helicobacter pylori strains from Ecuador

Yvette J. Debets-Ossenkopp1,*, Germán Reyes2, Janet Mulder1, Birgit M. aan de Stegge1, José T. A. M. Peters1, Paul H. M. Savelkoul1, J. Tanca3, Amado S. Peña4 and Christina M. J. E. Vandenbroucke-Grauls1

Departments of 1 Clinical Microbiology and Infection Control, and 4 Gastroenterology, Vrije Universiteit Medical Centre, de Boelelaan 1117, 1081 HV Amsterdam, The Netherlands; 2 Department of Molecular Biology, Universidad Católica, Guayaquil; 3 Department of Gastroenterology, SOLCA Hospital, Guayaquil, Ecuador

Received 24 June 2002; returned 11 August 2002; revised 13 September 2002; accepted 27 September 2002

In Ecuador, Helicobacter pylori infections are highly prevalent. A total of 42 H. pylori clinical isolates from 86 patients attending the outpatient clinic of the gastroenterology department of the university hospital of Guayaquil in Ecuador were characterized. Their susceptibility, and cagA and vacA status were determined. Resistance to metronidazole and clarithromycin was found in 80.9% and 9.5% of strains, respectively. Neither amoxicillin- nor tetracycline-resistant strains were found. The most prevalent genotype was the cagA+, vacA s1b,m1 type. This genotype was associated with gastric cancer and peptic ulcer. Typing by random amplified polymorphic DNA showed no genetic relationship among the strains.

Keywords: Helicobacter pylori, Ecuador, antibiotic resistance, typing, virulence factors

* Corresponding author. Tel: +31-20-444-0488; Fax: +31-20-444-0473; E-mail: yj.debets{at}vumc.nl


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