It was the reason that they started using colonic irrigation equipment back in the early 1950s. Succeptibility to infections of most types is due to digestive problems. Just taking betane HCl capsules after every meal goes a long way to beating and/or preventing infections, bodywide.
This, I don't agree with. It's possible that it might cover some troubles, but 'digestive problems' might already be a cover name for a current chronic infection.
Recent research about gliding bacteria show that they can produce a chemical called capnine that can shut down the immune system, which then lets in more aggressive bugs than the gliding bacteria themselves.
Since the gliding bacteria were found when testing artifical joints that had been replaced, the 'digestive problems' are likely at most one of several paths for likely infection. If adding stomach acid helps, then maybe the original problem was an infection that tended to reduce stomach acid levels.