Internet paranoia. Candida lives in us. On is. And is always around us. Candida is not in general a widespread illness. It is not the cause of vague or ambiguous symptoms. Don't buy into the hoaxsters who would have you buying their very expensive snake oil.
Forgive my frankness. "Candida" is both a genuine pathogen that makes people obviously sick, and the subject of a mostly-imaginary chronic illness that is diagnosed by independent medical thinkers and which we are told requires elaborate management. You'll notice that the latter never gets cured -- until the victim realizes what's going on. Look for some other cause of your ill-health and avoid this cult.