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