Published online Feb 6, 2016. doi: 10.4292/wjgpt.v7.i1.126
Peer-review started: April 30, 2015
First decision: July 25, 2015
Revised: October 16, 2015
Accepted: November 10, 2015
Article in press: November 11, 2015
Published online: February 6, 2016
Core tip: This review focuses on some aspects of infection and reinfection by Helicobacter pylori (H. pylori), particularly in the possible reservoirs of this bacterium. It also explores the association between gastric infection and these reservoirs. In addition, this review highlights possible reservoirs in animals and some routes of infection, and it considers the techniques used to diagnose this bacterium in different environments. The difficulty in accessing bacteria in reservoirs is a problem for H. pylori eradication in particular, and new discoveries in this field will contribute to the understanding of H. pylori infection mechanisms.