In 2005 the Karolinska Institute in Stockholm awarded the nobel prize in Physiology or Medicine to Marshall and Robin Warren, his long-time collaborator, for their discovery of the bacterium Helicobacter pylori and its role in gastritis and peptic ulce er disease 5/3/2016 Helicobacter pylori-Junqi's Lecture for md students5/3/2016 Helicobacter pylori-Junqi's Lecture for MD students 3 In 2005, the Karolinska Institute in Stockholm awarded the Nobel Prize in Physiology or Medicine to Marshall and Robin Warren, his long-time collaborator, "for their discovery of the bacterium Helicobacter pylori and its role in gastritis and peptic ulcer disease