Published online Sep 7, 2019. doi: 10.3748/wjg.v25.i33.4870
Peer-review started: May 20, 2019
First decision: July 21, 2019
Revised: July 29, 2019
Accepted: August 7, 2019
Article in press: August 7, 2019
Published online: September 7, 2019
Core tip: The assessment of pathogenicity of a plethora of Helicobacter pylori (H. pylori) virulence genes appears to be relatively difficult. In specific, H. pylori isolates show a high degree of geographic variability, with certain H. pylori genotypes being associated with a more severe clinical outcome in some regions, while presenting as virtually harmless variants in other studied populations. To date, cagA and certain allelic variants of vacA have been most consistently associated with severe gastroduodenal disease in both children and adults, whereas the role of outer membrane proteins, such as babA2, sabA, homB and oipA, is somewhat more ambiguous.