Candida albicans:

small, oval budding fungus or yeast that is the primary disease causing organism of the infection moniliasis candidiasis, commonly referred to as candida. 

Found in animals and in man. Has been isolated from the skin and mucosa of man, but has also been recovered from leaves, flowers, water, and soil. Reported to be allergenic. A common cause of superficial infection, oral and vaginal infection, sepsis, and disseminated disease. Cells from the organism are usually not airborne and are considered to be a normal component of the flora of mouth and other mucous membranes in the body. Thrush and other diseases caused by Candida albicans usually occur after prolonged treatment with antibiotics or steroids. No toxic diseases have been documented to date. 

Candida albicans is a species of yeast-like fungi normally a part of human gastrointestinal flora, but can become pathogenic when there is a disturbance in the balance of flora or in debilitation of the host (also called thrush fungus).