mycoplasma pneumoniae being one of the worst. but there are others. very hard to detect, probably many are unknown. this condition is so common that i would guess vit d really is a dangerous thing to play with, for almost anyone.
My doc told me that he has begun checking people for this now, and right away sees the pattern in others. of course we don't do the marshall protocall, but marshall is on to something with the underlying process.