A fungal infection caused by Candida microorganisms, most frequently by Candida albicans. Moniliasis rarely causes lesions in the liver, spleen, kidneys, bone, skin, but more commonly is seen in the tissues of the mouth (where it is referred to as oral thrush) or the vagina (when it it called a vaginal yeast infection). Moniliasis is not a contagious infection. Candida fungi exist normally not only in the mouth and vagina, but also in the gastrointestinal tract, where their growth is controlled by the presence of normally occurring bacteria. Uncontrolled overgrowth of the fungus may be caused by factors that reduce natural resistance, including illness, stress, and certain medications.