MRS-Sorbitol agar (MRSS)
MRS agar was prepared without glucose (10 g peptone; 8 g meat
extract; 4 g yeast extract; 2 g K2HPO4; 5 g sodium acetate; 2 g
ammonium citrate; 0.2 g magnesium sulfate; 0.05 g manganese
sulfate; 1 mL Tween 80; and 10 g agar dissolved in 1 L distilledwater) with addition of 10 g/L D-sorbitol. The medium was autoclaved
at 121 C for 15 min (Oberg et al., 2011).