In 1899 he described bacteria living in the human stomach that he named "Vibrio rugula". He speculated that they were responsible for stomach ulcers, gastric cancer and achylia. It was one of the first observations of Helicobacter pylori. He published those findings in 1899 in a book titled "Podręcznik chorób żołądka" ("Handbook of Gastric Diseases") but it was available only in Polish and went unnoticed.
- Konturek JW (December 2003). "Discovery by Jaworski of Helicobacter pylori and its pathogenetic role in peptic ulcer, gastritis and gastric cancer" (PDF). J. Physiol. Pharmacol. 54 Suppl 3: 23–41. PMID 15075463. Retrieved 2009-05-15. Archived March 26, 2009, at the Wayback Machine.
- "The Nobel Prize in Physiology or Medicine 2005". Retrieved 2009-05-15.
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