Patent ID: 8226936

Claim:
An isolated Bifidobacterium animalis subspecies lactis strain containing an inactivated tetW on its chromosome, wherein said strain is selected from the group consisting of: (i) the Bifidobacterium animalis subspecies lactis strains having the registration number DSM 18735 (CHCC 9870) or DSM 18776 (CHCC 9884), and (ii) a mutant strain which is obtained by using either of the deposited strains DSM 18735 (CHCC 9870) and DSM 18776 (CHCC 9884) as starting material and said mutant strain has a minimum inhibitory concentration of 1.5 microgram tetracycline/ml or less, wherein the tetW gene of said mutant comprises either the sequence of SEQ ID NO: 3 [GAA AAT ACA AGC] or the sequence of SEQ ID NO: 6 [GAA TAC AGG CTT].