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Species diversity and involvement of Helicobacter pylori in digestive pathology
Authors: Cristian-Adrian Constantinescu, Elena-Mihaela Constantinescu
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The incidence of Helicobacter pylori infection is between 3-10% of the population per year in
developing countries and 0.5% per year in developed countries. There are significant correlations between
the prevalence of H. pylori infection, hygiene and living conditions of childhood.
The natural reservoir of H. pylori infection is human, describes many possible routes of
transmission: oral-oral, fecal-oral, gastro-oral, iatrogenic, aquatic and zoonotic
Based on genetic differences, H. pylori have been classified in seven varieties, with different
geographical distribution, prevalence specific ethnic groups. Suggested origin of H. pylori infection is in East
Africa, from where it spread ago a hundred thousand years
The first form of the disease, which manifests itself in all patients infected with H. pylori is active
chronic gastritis. Later complications occur or developments such chronic gastritis to ulcer disease and
gastric cancer.