Possibly the unusual growth of these strains in the presence
of sorbitol could be explained by culture rotation, which is a
technique performed by several industrial manufacturers of cultures
in order to control bacteriophages. The inhibition of Lactococcus
lactis in MRSS agar incubated at 45 C suggests that the
incubation temperature was responsible for the lack of development
in this medium as Lactococcus lactis does not grow at 45 C The incubation temperature was also
responsible for the inhibition of L. acidophilus in M17 agar at 30 C
from cheeses (Table 4), since this microorganism has the optimum
growth temperature between 35 and 40 C