I personally have suffered from yersinia enterocolitica which caused very little gastric distress but triggered a lot of other type of nasty stuff. For years i have connected everything to YE but no one seems to know much of it. I had antibodies to YE at least for a decade so it was chronic.
There are a lot of people who doesnt know they have suffered from enteric bacterial infection and have no idea it could have caused their illness. Instead they are told they have IBS and they are stressed out.