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Background-Virulence factors of Helicobacter pylori are associated with peptic ulcer disease and may be also associated with the eYcacy of treatment. Aims-To determine the relation between the vacA and the cagA status of H pylori, clinical disease, and treatment outcome. Patients-121 patients with H pylori infection and peptic ulcer disease or functional dyspepsia were treated by quadruple antibiotic therapy in two groups for one and two days, respectively. Methods-DNA was isolated from gastric antral biopsy specimens, taken before and after treatment, and the vacA and cagA status was determined by polymerase chain reaction and reverse hybridisation. Results-Peptic ulcer disease was significantly associated with the vacA s1 type, and cagA positivity, but not with the vacA m type. Treatment eYcacy was significantly higher in patients with peptic ulcer disease, or infected with cagA+/vacA s1 strains. Conclusions-The strong association between the cagA and vacA status and peptic ulcer disease was confirmed. Cure rates seem to be higher for patients with cagA+/ vacA s1 H pylori strains, which is consistent with the higher cure rate observed among ulcer patients compared with functional dyspepsia patients. Therefore, treatment studies may require stratification for presence of ulcers as well as H pylori genotypes. (Gut 2000;46:321-326)

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SUMMARYBackground : Peptic ulcer patients need to be treated with antimicrobials to cure Helicobacter pylori infection. Seven-day quadruple therapy is the regimen with the highest cure rates. An ultra-short quadruple therapy was evaluated prospectively. Methods : Forty-six consecutive H. pylori positive patients (33 had proven ulcer disease) were prescribed lansoprazole 30 mg b.d. on days 1-4, and on day 4 they received in addition tripotassium dicitrato bismuthate 120 mg, tetracycline 250 mg and metronidazole 250 mg at 09