Two hundred samples of traditional dairy products, namely, cheese, yogurt, curd, shiraz, and tarkhineh) were exploited as sources of isolation. A total of 2 g for each sample was completely homogenized in sodium citrate solution (2% w/v) with the use of a circulator. A total of 1 ml of the homogenized samples was added to 9 ml of MRS broth and incubated at 37 C for 24 h. A total of 100 ml of incubating samples was spread on MRS agar media. Single col- onies were picked from the agar media and inoculated in 10 ml of MRS broth. Cell suspensions were then incubated for 24 h at 37 C