Ten grams of each sample were aseptically added into 90 ml of sterile 0.9% NaCl solution. Homogenized and serially diluted, 1 ml of the diluents was pour-plated on de Man, Rogosa and Sharpe (MRS) agar, respectively. Plates were incubated for 24 hrs at 35oC. Total of 35 representative colonies were randomly picked and sub-cultured to obtained pure culture. The isolates were maintained on MRS agar plates (Oxoid No. CM361) containing 50 mg/l of nystatin (Sigma, Australia) kept at 4oC under anaerobic conditions. The stock cultures were stored at -4oC for subsequent use and sub-cultured for 4-week interval.