Microbiology All of the following are true about Helicobacter pylori except: A About 50% of world population affected B 85% of population is affected, in some developing countries C All children in developing countries have immunity by five years of age D Infection is common in low socio-economic status 💡 Explanation All of the following are true about Helicobacter pylori except: ✓ Correct Answer: C. All children in developing countries have immunity by five years of age