World Gastroenterology Organisation Global Guidelines Helicobacter pylori in developing countries August 2010 : WGO global guidelines

Helicobacter pylori (Hp) is found in half the population of the world. Its prevalence is highly variable in relation to geography, ethnicity, age, and socioeconomic factors - high in developing countries and lower in the developed world. In general, however, there has been a decreasing trend in the prevalence of Hp in many parts of the world in recent years.