Used for the preparation of Egg Tellurite Glycine Pyruvate Agar (ETGPA). May also be used for BD Difco™ 2 kg. the identification of staphylococci on the basis of their ability to clear egg yolk. Use with EY Tellurite Enrichment (Cat. Nos. 277910, 212357 and 257201) for the detection and enumeration of coagulase-positive staphylococci from food, skin, soil, air, and other materials.. Baird-Parker Agar Base BD Difco™ 500 g ISP Medium 1 BD Difco™ 500 g. International Streptomyces Project Tryptone Yeast Extract Broth. ISP Medium 2 BD Difco™ 500 g. International Streptomyces Project Yeast Malt Extract Agar. ISP Medium 4 BD Difco™ 500 g. International Streptomyces Project Inorganic Salts Starch Agar. Egg Yolk Tellurite Enrichment BD Difco™ 6 x 100 ml. The enrichment consists of 30% egg yolk suspension with 0.15% potassium tellurite. For the isolation of S. aureus use with: Baird-Parker Agar Base (Cat. Nos. 276840 and 276810).