Bifidobacterium animalis subsp. lactis i797, method for separation and purification thereof, and use thereof

A medicine comprising Bifidobacterium animalis subsp. lactis i797 wherein the strain of Bifidobacterium animalis subsp. lactis i797 is preserved in the China General Microbiological Culture Collection Center, the preservation address being:

• No. 3, Yard No. 1, Beichen West Road, Chaoyang District, Beijing, and the preservation date being Aug. 20, 2019, and the preservation number being CGMCC No. 18403, wherein the medicine is in a dosage form of capsule, tablet, pill or powder.

A method for regulating an intestinal tract of a subject, or for balancing intestinal flora of a subject, wherein the method comprises administering, to the subject, a drink containing Bifidobacterium animalis subsp. lactis i797 wherein the strain of Bifidobacterium animalis subsp. lactis i797 is preserved in the China General Microbiological Culture Collection Center, the preservation address being:

• No. 3, Yard No. 1, Beichen West Road, Chaoyang District, Beijing, and the preservation date being Aug. 20, 2019, and the preservation number being CGMCC No. 18403;
• and wherein the method further comprises evaluating, for the subject, one or more indexes selected from frequency of defecation, difficulty in defecation, hardness of feces, and shape of feces.