S100A8 and gastritis: The average number of neutrophil infiltration in CagA+ H. pylori positive adjacent tissues is significantly higher than CagA+ H. pylori negative adjacent tissues in these two tested arrays (87 ± 88 vs. 47 ± 76, p = 0.0005), confirming that H. pylori infection attracts neutrophil infiltration into gastritis tissues as previously reported33, 34.