Candida can only enter the bloodstream if you are severely immuno-compromised, and once candida is in the bloodstream you have a directly life-threatening situation. We’re talking emergency room and a life expectancy of one to two weeks.
I do not know about the specific IgX values you mention. I do know that these can be raised even if the pathogen is not in the bloodstream. This is caused by the white blood cells, which can leave the bloodstream and go almost anywhere in the body. That way, they can detect pathogens that are not in the bloodstream, and start an immunoreaction against those pathogens. That results in increased IgX levels.
Though this is only partial information (I don’t write about things of which I don’t have enough knowledge), I hope it helps, even if only a bit.