“…Ali the measures were made in duplicate. To differentiate the microflora, the following media were used: -mesophilic aerobic microflora: plate count agar (PCA, Difco); aerobic incubation at 30 oC for 3 days (AFNOR V08-011, 1978); -enterocococci: kanamycin esculin agar (KEA, Merck); aerobic incubation at 37 "C for 2 days (Isenberg et al, 1970); -Micrococcaceae: mannitol salt agar (MSA, Difco); aerobic incubation at 30 "C for 3 days (Chapman, 1948); -coliforms: violet red bile agar (VRBA, Difco); aerobic incubation at 30 "C for 24 h (AFNOR V08-054,1993); -yeasts: glucose chloramphenicol agar; aerobic incubation at 25 -c for 3 days (FIUIDF 94B, 1991); -propionibacteria: sodium lactate agar and cloxacillin (SlAC); anaerobie incubation at 30 "C du ring 6 days (Drinan and Cogan, 1992); -spores of butyric acid bacteria: Bryant-Burkey broth modified by Bergère (Biokar); anaerobic incubation at 37 "C du ring 7 days; spores of butyric acid bacteria were counted in tubes according to the most probable number method (CNERNA,1987); -thermophilic streptococci: medium 17 (M17); aerobic incubation at 42 "C for 3 days (Terzaghi and Sandine, 1975); -thermophilic lactobacilli: de Man, Rogosa, Sharpe (MRS, Difco); anaerobic incubation at 42 oC for 3 days (de Man et al, 1960); -facultatively heterofermentative lactobacilli: Facultativ Heterofermen-tativen laktobazillen or FH agar (Isolini et al, 1990); anaerobie incubation at 38 oC during 3 days. To increase the selectivity of the medium, nalidixic acid was added (40 mg/Llo…”