in elliker medium and elliker soft agar medium a culture medium obtained by adjusting the concentration of agar of elliker agar medium to 0 7 w w cooled to 45 u00b0 c subsequent to its melting were placed as a layer over the agar plates respectively the test bacteria consisted of 45 thermophilic bacteria strains used as starters for fermented milk and 27 lactobacillus delbrueckii subsp bulgaricus strains the thus overlayed agar plates were incubated at 37 u00b0 c for 24 hours followed by the determination of the presence or absence of an inhibited band as a result such an inhibited band was observed on 43 thermophilic bacteria strains and 7 lactobacillus delbrueckii subsp bulgaricus strains the lactic acid bacteria of the present invention were inoculated in pasteurized skim milk and then cultured to provide starter a for fermented milk a mixed starter of commercial thermophilic bacteria and lactobacillus delbrueckii subsp bulgaricus were inoculated in pasteurized skim milk and then cultured to provide starter b for fermented milk both the starters were inoculated to the concentration of 1 5 each to the same pasteurized yogurt mix pasteurized milk enriched with powdered skim milk followed by incubation at 42 u00b0 c until the lactic acid acidity reached 0 8 the.