> The guy who won the Nobel prize for giving himself an ulcer estimated it as 90% That's worldwide. In developed countries the proportion is closer to 10 to 15

> The guy who won the Nobel prize for giving himself an ulcer estimated it as 90% That's worldwide. In developed countries the proportion is closer to 10 to 15% [1, 2] [1] https://www.jwatch.org/na50875/2020/02/24/prevalence-h-pylori-positive-peptic-ulcers-decreasing-us https://www.jwatch.org/na50875/2020/02/24/prevalence-h-pylor... [2] https://pubmed.ncbi.nlm.nih.gov/31972622/ https://pubmed.ncbi.nlm.nih.gov/31972622/