There are many examples of medical knowledge that I think everyone should know. This is one of them.

Usually, this is screened non-invasively (with breath, stool or antigen tests) and then confirmed (with endoscopies, for example).

In countries where H pylori is more prevalent, experts recommend mass screening and eradication of the pathogen: gut.bmj.com/content/69/12/…

In total it's estimated that H pylori causes 4-5% of new cancer cases worldwide.

It's the most cancer-causing pathogen we know of.