Yep, I too believe that this can only be due to some internal mess-up. Cos if people who say they got it from biting should have been cured when they stopped biting, which obviously is not the case...
Having sed that, another theory which also makes sense is when we got ec it might be due to some factor or the other, now even if those factor(s) have been resolved but once we have got ec, resolving the factors might be inconsequential in curing ec!
So I think we need to take holistic approach in curing ec and candida might just be one of them...