摘要: To counter the arguments that Helicobacter pylori is commensal flora, what better quotes can be those by Blaser: ‘Helicobacter species may have been part of indigenous gastric biota humans and our prehuman ancestors from earliest times’ ‘to date no benefits H. infection identified’2. This was followed only 3 years ago with assertion ‘the author unaware any direct evidence or specific subset carries to humans’3.