Yes, just because ibuprofen can cause stomach ulcers, does not mean it will. NSAIDs are a scientifically accepted risk factor for stomach ulcers.
It is more the colonization and the resulting endotoxins. I did a quick search on the internet and H. pylori could be called an infectious agent. I will need to check one of the clinical books but they are out of reach right now.
There are other bacteria that are found in almost all of us that perform important tasks in our digestive system. If they leave the area where they normaly colonize in the body, they can cause disease. There is a specific term for this, it is bio...., but I forgot the exact term. This is also something I can check tomorrow.
I am sorry that I could not answer your questions in detail, but I will get back to you in the morning. Thank you for your engaging comment though!
What is your take? Do you think H. pylori could be considered an infection?
Cheers!