RT Journal Article SR Electronic T1 Vaccine against Helicobacter pylori: fact or fiction? JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 728 OP 730 DO 10.1136/gut.41.6.728 VO 41 IS 6 A1 MICHETTI, PIERRE YR 1997 UL http://gut.bmj.com/content/41/6/728.abstract AB