Which groups of people are vulnerable to infection with Helicobacter pylori? 1, children: children susceptible period, childhood is a period of dramatic increase in the rate of infection, rising at a rate of 3-10% per year, to 10 years of age there are 40-60% of people infected, after 10 years of age the infection rate slows down. 2, the infection balance period, childhood and adulthood is basically the same, but some regions after the age of 50 years infection rate increased significantly. Of course, H. pylori infection and economic status, living conditions, literacy, lifestyle habits and other influencing factors are positively correlated.