S100A8 and infection: Interestingly, we observed higher levels of CagA and phosphorylated CagA in strain VN1291 at 6 h compared with levels in other strains, and increased levels of CagA at 24 h post infection in strain CHC155 compared with that in strain 26695, even if we take into account the strain specificity of the commercial CagA antibody used in our immunoblot analysis, which was originally generated using Western-CagA epitopes of a Western H. pylori strain.