BIGGY Agar is used for the isolation and presumptive identification of Candida spp. An abbreviation for Bismuth Glucose Glycine Yeast Agar, BIGGY Agar is a modification of the formula described by Nickerson. Yeast Extract provides the nitrogenous, carbon and vitamin sources in this medium. Glycine is incorporated to stimulate fungal growth. Dextrose is the fermentable carbohydrate. Bismuth Ammonium Citrate and Sodium Sulfite are selective agents against bacteria. Candida spp. form brown to black colonies due to the reduction of Bismuth Ammonium Citrate. Agar is the gelifying agent.