Helicobacter pylori in allergic and non-allergic rhinitis does play a protective or causative role?

Purpose Many studies have investigated the effect of Helicobacter pylori (H. pylori) colonization on the development of allergic diseases, but with conflicting results. The purpose of this cross-sectional observation study is to estimate H. pylori prevalence in allergic and nonallergic nasal conditions and compare with normal population.