The M17 Agar is also used for
enumeration of S. thermophilus Besides the M17 agar, ST agar (S. thermophilus
agar) was effective for enumeration of S. thermophilus in the
presence of Lactobacillus delbrueckii subsp. bulgaricus and L. acidophilus
also reported the selectivity of ST agar for enumeration of
S. thermophilus in the presence of L. acidophilus and Bifidobacterium
longum. Both the MRS Agar pH 5.2 and the Reinforced Clostridial
Agar (RCA) pH 5.3 were effective for enumeration of L. delbrueckii
subsp. bulgaricus in the presence of S. thermophilus, L. acidophilus
and Bifidobacterium sp.