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 2025. Sun. 15 Jun 2025. <https://www.nobelprize.org/prizes/medicine/2005/summary/>

Back to top Back To Top Takes users back to the top of the page

Nobel Prizes and laureates

Nobel Prizes 2024

Six prizes were awarded for achievements that have conferred the greatest benefit to humankind. The 12 laureates' work and discoveries range from proteins' structures and machine learning to fighting for a world free of nuclear weapons.

See them all presented here.

Illustration

Explore prizes and laureates

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