Trypticase™ Soy Agar 20. General purpose media which support the growth of nonfastidious as well as moderately fastidious microorganisms. The nutritional composition of Trypticase Soy Agar has made it a popular medium for many years. It is the medium specifiedas Soybean-Casein Digest Agar Medium in the United States Pharmacopeia, European Pharmacopeia, and Japanese Pharmacopeiafor the total aerobic microbial count portion of the microbial limit testing procedures. The medium is used for a multitude ofpurposes including maintenance of stock cultures, plate counting, isolation of microorganisms from a variety of specimen types and as a base for media containing blood. It is included in the compendia of methods for the examination of water, wastewater and foods.