The results of the selective enumeration of L. acidophilus from
yoghurt using different culture media are shown in Table 3. It was
observed that both MRSB and MRSC were selective for enumeration
of L. acidophilus, inhibiting the growth of L. bulgaricus and
S. thermophilus. For enumeration of L. bulgaricus, the medium RCA
pH 5.3 incubated at 45 C under anaerobic conditions was
considered effective, since the other cultures were inhibited under
these conditions. With respect to the enumeration of
S. thermophilus, ST agar incubated at 30 C under anaerobic conditions
was selective,