The L. acidophilus La5 is one of the most studied probiotic
strains, with application in different dairy products. For selective
enumeration of this microorganism in the presence of mesophilic
cultures, the manufacturer recommends MRS agar containing
clindamycin incubated at 37 C for 72 h under anaerobic conditions
(Christian Hansen, 2007). As reported by Van De Casteele et al.
(2006), this culture medium was effective for enumeration of
L. acidophilus in the presence of commercial lactic acid starters
added during the manufacturing processes of yoghurt and cheese.