• Helicobacter Pylori Eradication Confirmed by Urea Breath Test [ Time Frame: Week 6 and week 10 follow-up visits ] [ Designated as safety issue: No ]
  H. pylori Eradication defined as a negative C13-UBT (urea breath test) result at both Week 6 and Week 10 follow-up visits.
  
  

• Number of Patients Experiencing Treatment Emergent Adverse Events. [ Time Frame: at the end of treatment (day 8-14), week 6 and wek 10 follow-up visits. ] [ Designated as safety issue: Yes ]

  A treatment-emergent adverse event is defined as an event not present prior to exposure to the study medication or any event already present that worsens in either intensity or frequency following exposure to study medication up to 30 days after study discontinuation.

  All safety analysis based on the safety population.

  
  
• H. Pylori Eradication and Presence or Past History of Peptic Ulcers [ Time Frame: Week 6 and week 10 follow-up visits ] [ Designated as safety issue: No ]
  Eradication rates in the subset of patients with peptic ulcer (current or past history) at baseline are reported based on the per protocol population. Eradication must be confirmed at week 6 and week 10 by a negative Urea Breath Test conducted within the allocated windows.
  
  
• Clarithromycin Resistance [ Time Frame: Measured at baseline ] [ Designated as safety issue: No ]
  Eradication rates in subset of patients infected with a bacterial strain confirmed as resistant to clarithromycin at baseline. Resistance to clarithromycin defined as Minimum Inhibitory Concentration (MIC) of 1 ug/ml and above
  
  
• Metronidazole Resistance [ Time Frame: Measured at baseline ] [ Designated as safety issue: No ]
  Eradication rates in subset of patients infected with a bacterial strain confirmed as resistant to metronidazole at baseline. Resistance to metronidazole defined as Minimum Inhibitory Concentration (MIC) above 8 ug/ml
  
  
• Overall Compliance to Study Medications [ Time Frame: At the end of the treatment phase (days 8-14) ] [ Designated as safety issue: No ]
  Overall compliance: number of capsules dispensed - number of capsules returned/Number of prescribed capsules X 100. Percentages based on safety population
  
  
• Number of Patients With Bismuth Plasma Concentrations Above the Toxic Level [ Time Frame: Baseline (both arms), end of treatment (Day 11-14) and end of study (Day 70) OBMT arm only ] [ Designated as safety issue: Yes ]
  Tolerability of OBMT with respect to plasma bismuth concentrations: number of patients with bismuth concentrations above the toxic level (50 ug per liter)
  
  

The study will include three phases: screening, treatment and follow-up. Screening: this phase will last a maximum of 30 days and subjects eligibility will be evaluated after informed consent signature. Endoscopy and Urea Breath test will be performed in addition to the baseline routine evaluations.

Treatment: Subjects assigned to OAC will be treated for 7 days. Those assigned to Pylera will be treated for 10 days. A randomization visit will take place on Day 0 and an end-of-treatment visit will take place between day 8 and 14.

Follow-up: includes two visits. approximately one and two months post-treatment. Eradication of H. Pylori will be confirmed through UBT, and resistance will be evaluated in case of treatment failure. These subjects will undergo an endoscopy.