(1) Infection of the oral tissues with Candida albicans; often an opportunistic infection in humans with AIDS or those suffering from other conditions that depress the immune system; also common in normal infants who have been treated with antibiotics. (2) In veterinary medicine, refers to moist putrifying condition of the equine hoff affecting the area called the frog; producing necrotic foul-smelling black discharge; may extend into the medial and lateral sulci, eroding them, and may involve the bars and sole area. Left untreated, the frog may be undermined and permanent structural damage may ensue. [fr. the thrush fungus, Candida albicans]