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cagA positive and negative Helicobacter pylori strains are simultaneously present in the stomach of most patients with non-ulcer dyspepsia: relevance to histological damage.
Figura N, Vindigni C, Covacci A, Presenti L, Burroni D, Vernillo R, Banducci T, Roviello F, Marrelli D, Biscontri M, Kristodhullu S, Gennari C, Vaira D. Figura N, et al. Among authors: kristodhullu s. Gut. 1998 Jun;42(6):772-8. doi: 10.1136/gut.42.6.772. Gut. 1998. PMID: 9691913 Free PMC article.