Asymptomatic Subjects. Sixty-five healthy, asymptomatic volunteers aged 54.2 ± 2.0 years (mean ± SEM; range 20–86 years) were involved in the present study. All subjects were initially screened for H.

Diagnosis of H. pylori infection can be clinical or based on noninvasive or invasive testing. In 2007, the American College of Gastroenterology published guidelines for H. pylori testing 15 (Table 2).