Walery Jaworski, was one of the pioneers of gastroenterology in Poland. 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. Wikipedia
The definitive Wikipedia entry for Walery Jaworski. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Walery_Jaworski