Oral candidiasis, also oral thrush, is an infection of yeast fungus, Candida albicans, (or, less commonly, Candida glabrata or Candida tropicalis) in the mucous membranes of the mouth. Thrush is only a temporary candida infection in the mouths of babies. However, the term is sometimes expanded to include candida infections occurring in the mouth and throat of adults, also known as candidosis or moniliasis.