Agar BiGGY agar is a partially selective and differential medium for the cultivation and identification of Candida species from pure cultures or clinical specimens.
Candida species, through a process of substrate reduction, reduces the bismuth salt to bismuth and sulfite to sulfide. Bismuth and sulfide combine to form a brownish to black precipitate that stains colonies and may diffuse into the medium.
Also bismuth and sulfur compounds are inhibitory to many bacteria. Yeast extract and glucose provide essential nutrients for growth. Glycine is an additional nutrient, but also inhibits many bacterial species at the high concentration used in this medium.
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