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Yeast: Candida albicans is a fungal organism, or yeast, that thrives in your mouth, gastrointestinal tract, and skin; your body produces bacteria that keep it in check. When fungal growth exceeds the body's ability to control it, yeast infection develops. This can happen when you are weakened by illness or upset by stress. Modern antibiotics that treat many ailments can actually kill the bacteria that control fungal outbreak.