Nobel Prize in Physiology or Medicine 2005

Barry J. Marshall

Photo: C. Northcott

Prize share: 1/2

J. Robin Warren

Photo: U. Montan

Prize share: 1/2

The Nobel Prize in Physiology or Medicine 2005 was awarded jointly to Barry J. Marshall and J. Robin Warren "for their discovery of the bacterium Helicobacter pylori and its role in gastritis and peptic ulcer disease"

To cite this section
MLA style: The Nobel Prize in Physiology or Medicine 2005. NobelPrize.org. Nobel Prize Outreach 2026. Fri. 14 Aug 2026. <https://www.nobelprize.org/prizes/medicine/2005/summary/>

Go to the top of the page

Explore prizes and laureates

Look for popular awards and laureates in different fields, and discover the history of the Nobel Prize.