Probiotics are widely recommended for the treatment of Candida - a fungal infection - because they establish large, healthy populations of friendly bacteria that compete with the Candida that is trying to take up residence in the intestine. Probiotics are also essential in the treatment and prevention of thrush, vaginal yeast infections, and athlete's foot. Good health depends fundamentally upon the more than 400 types of friendly, symbiotic bacteria that inhabit the digestive tract.
from, http://www.healingdaily.com/detoxification-diet/probiotics.htm