Yeast extract 1 g Proteose peptone (Difco No.3) 1 g Casamino acids (Difco) 1 g Glucose 1 g NaCl 1 g Na pyruvate 0.5 g MgSO4 . 7 H2O 0.1 g K2HPO4 0.6 g Agar 15 g Distilled water 1000 ml Adjust pH to 7.2. Sterilize at 121 °C for 15 min.