<i>cag</i> A positive and negative <i>Helicobacter pylori</i> strains are simultaneously present in the stomach of most patients with non-ulcer dyspepsia: relevance to histological damage

Abstract

Most patients with nonulcer dyspepsia are infected by both cagA+ and cagA- H pylori colonies. The cagA status of infecting organisms may play a role in the development of atrophy and intestinal metaplasia.