| prevalence of helicobacter pylori infection in fortaleza, northeastern brazil. | the prevalence of helicobacter pylori infection was assessed in a randomly selected sample of individuals from low-income community in fortaleza, northeastern brazil. overall, 384 out of 610 participants (62.9%) were h. pylori positive. a 47.5% infection rate was found in subjects aged six months to 10 years old, increased to 73.3% in subjects aged 11-20 years and then continued to increase with age reaching up to 87% in those over 60 years old. after this age group, the prevalence decreased sli ... | 2005 | 16254664 |