| helicobacter pylori infection in the colombian andes: a population-based study of transmission pathways. | in 1992, the authors studied helicobacter pylori infection and exposures relevant to person-to-person, waterborne, foodborne, and zoonotic transmission in a census sample of 684 2-9-year-old children in aldana, nariño, a rural community in the colombian andes. h. pylori prevalence, as determined by the 13c-urea breath test, was 69%, and prevalence increased from 53% in 2 year-olds to 87% in 9 year-olds. beginning at 3 years of age, a higher percentage of males compared with females were infected ... | 1996 | 8686698 |