I had no idea what Helicobacter pylori was. It's a bacteria that, apparently, lives in the digestive tract of half the world's population.[1]
[1] http://www.cancer.ca/en/prevention-and-screening/reduce-canc...
[1] http://www.cancer.ca/en/prevention-and-screening/reduce-canc...
Surprised by this. But Seems not to be the best of the germs. A nobel price was given due to the discovery of Helicobacter and ulcer disease:
https://www.nobelprize.org/prizes/medicine/2005/press-releas...